Sleep is one of the most important aspects of physical and mental health, yet it is one of the aspects of health and wellness that is first neglected even when it helps to support the brain, heart, immune system, metabolism, hormones, memory and our energy and mood during the day. Sleep is vital yet overlooked.

During sleep, the brain activates the glymphatic system, which help to clear metabolic waste. This helps with memory consolidation, allowing the brain to gain and retain new information and connect it to already existing information.

Sleep also influences hormones such as leptin and ghrelin which are involved with hunger and appetite. Have you ever pulled an “all nighter”. Did you notice how much more hungry you were and the urge to constantly snack? When sleep is continually interrupted, it can become increasingly difficult to regulate appetite which can contribute to overeating and weight gain.

Sleep also benefits the cardiovascular system by giving it time to recover. Blood pressure usually decreases during sleep which in turn reduces the workload placed on the heart. Chronic and poor sleep is associated with high blood pressure, cardiovascular disease as well as impaired immune function, weight gain (as mentioned earlier) and poor cognitive function.

How Much Sleep Do You Need?

The general guideline for healthy adults is to aim for 7-9 hours of sleep each night.

Of course, life can get in the way sometimes and while the occasional poor night’s sleep is okay, regular sleep of less than 7 hours can result in decreased daytime performance and increased long term health risks. On the other hand, constantly sleeping more than 9 hours per night may also be associated with negative health outcomes for some people. Keep in mind that sleep is highly personal and varies from person to person.

The main goal is to get enough consistent, high quality sleep that makes you wake up feeling fresh and reenergized, not solely spending more time in bed. The actual sleep matters most.

Why Sleep Consistency Matters

Maintaining a regular sleep schedule is one of the most important habits to support the body’s internal clock.

You can help support your internal clock by going to bed and waking up at roughly the same time each day, including the weekends. Having an inconsistent sleep/wake routine can disrupt circadian rhythms and make it harder to fall asleep, make it harder to wake up leaving you feeling groggy and impair daytime energy.

Consistently waking up at the same time each day is particularly useful as it gives your brain a reliable signal that the day has started.

Morning Sunlight and Exercise

The habits that support good sleep begin in the morning.

Morning sunlight

Natural sunlight in the morning helps to sync your circadian rhythm which controls alertness, sleepiness and melatonin production.

Aim for 20-30 minutes of morning sunlight before 10am or after 3pm whereas sunlight between 10-3 is best for vitamin D production. Morning sunlight signals to your brain that the day has started and can help you to fall asleep earlier later in the evening.

Research also suggests that greater morning light exposure is associated with an earlier sleep midpoint and over better sleep quality.

Regular exercise

Physical activity can improve sleep quality and increase the amount of deep sleep you get.

Aim for approximately 150 minutes of moderate intensity activity per week of 75 minutes of intense activity. A single bout of 30 minute moderate intensity activity can help to improve sleep the same night.

Check out this link on The Minimum Effective Workout Plan for Maintaining Muscle as You Age – SiPhox Health.

Exercise should help support sleep and sleep should help to support exercise and recovery. Avoid sacrificing sleep to fit in a workout.

Sleep Hygiene and Evening Habits

Sleep hygiene refers to the habits and environment that prepares your body for quality, restful sleep.

Make sure your bedroom is:

• Cool
• Dark
• Quiet
• Comfortable

Use a pillow and mattress that are right for you. Blackout curtains, earplugs and a white noise machine can also help to create a more restful sleep environment. Consider going around and taping up any light that may be emitting from power outlets and charging devices.

Try reserving the bed for sleep and intimacy only and avoid using the bed as a space for working, studying, eating, watching T.V. and scrolling on your phone. This can help strengthen the association between going to bed and falling asleep.

Screens

Phones, tablets, televisions and all of the other light emitting devices around can suppress melatonin and increase awakeness near to bedtime.

Try to turn off and avoid screens 30-60 minutes before bed. This is also a good time to start dimming the light around the house.

Caffeine

Caffeine blocks adenosine receptors which is one of the signals that helps your body feel sleepy. Try to avoid caffeine after midday (2pm) when possible. The half life of caffeine is around 8 hours meaning that 8 hours after caffeine consumption, half will still be circulating in your system.

Alcohol

Alcohol may initially make you feel drowsy, but it can disrupt the second half of the night. It may reduce REM sleep, increase awakenings, and leave you feeling less refreshed the next morning.

Avoid relying on alcohol as a sleep aid and avoid alcohol 4 hours before time. This would mean the last call is at 7pm for an 11pm bedtime.

Evening meals

Avoid large, heavy, or unhealthy meals approximately 2 hours before bedtime. Eating too much too close to bedtime may cause digestive discomfort, or acid reflux, making it harder to stay and fall asleep.

Stress Management and Bedtime Journaling

A racing mind is a common reason people struggle to fall asleep. Relaxation practices can help shift the body away from a high-alert “fight or flight” state and toward a calmer resting state.

Helpful options include:

• Mindfulness meditation
• Slow breathing
• Progressive muscle relaxation
• Mindful walking in nature
• Bedtime journaling

Progressive muscle relaxation

Progressive muscle relaxation involves gently tensing and then releasing different muscle groups.

Tense each muscle group for approximately 5–10 seconds, then slowly release it while focusing on the feeling of relaxation. Work gradually through the feet, legs, hips, abdomen, shoulders, face, and hands.

Avoid tensing the muscles to the point of pain.

The five-minute to-do list

If unfinished tasks keep running through your mind, spend five minutes before bed writing a specific to-do list for the next day or coming days.

Writing future tasks down may help “off-load” them from your mind so you do not have to keep mentally rehearsing them.

Be specific. Instead of writing “work on project,” list the individual actions you need to complete. Journaling about completed tasks may not provide the same sleep-onset benefit.

Nature walking

A mindful nature walk may also improve mood and sleep difficulties. One studied approach used approximately 35 minutes of mindful walking, with attention directed toward the surroundings and present moment.

Supplements That May Support Sleep

Behavioral changes should remain the foundation of a sleep-improvement plan. Supplements may provide additional support, but they should not replace a consistent sleep schedule, morning light, exercise, stress management, or a supportive bedroom environment.

Magnesium Bisglycinate

Magnesium supports nervous system function and relaxation.

A study using 250 mg of elemental magnesium daily for four weeks found a modest improvement in insomnia severity.

The evidence remains limited and mixed. Benefits may be greater in people with low dietary magnesium intake.

Holy Basil

Holy basil, also called tulsi, is an herb that has been studied for stress and sleep support.

A standardized extract taken at 250 mg daily for eight weeks was associated with reduced perceived stress and improved subjective sleep quality.

The supplement was well tolerated in the study, but individual responses may vary.

L-Theanine

L-theanine is an amino acid naturally found in tea.

Research suggests it may support:

• Sleep quality
• Daytime function
• Sleep onset

However, the evidence is mixed because many studies combine L-theanine with other ingredients, making it difficult to determine its independent effect.

Speak with a healthcare professional before using supplements if you take medications, have a chronic health condition, are pregnant, or are breastfeeding.

What to Track

Tracking a few simple measures can help you understand whether your sleep routine is working.

Sleep duration

The total amount of time you spend asleep.

Aim for 7–9 hours per night.

Sleep latency

The amount of time it takes to fall asleep after going to bed.

A sleep latency of less than 30 minutes is a useful general target.

Sleep efficiency

The percentage of your time in bed that you are actually asleep.

A sleep efficiency above 85% is a useful general target.

Daytime energy

Pay attention to your alertness, focus, mood, and sleepiness during the day. How you feel and function can be just as important as the numbers recorded by a device.

A sleep diary, app, or wearable may help you monitor trends. Wearable devices are useful for patterns but may not measure total sleep time or sleep stages with clinical accuracy.

When to Seek Professional Help

General sleep habits may not be enough when an underlying sleep disorder is present.

Speak with a healthcare professional if you experience:

• Persistent difficulty falling or staying asleep
• Excessive daytime sleepiness
• Loud or chronic snoring
• Gasping or choking during sleep
• Frequent nighttime awakenings
• Sleep problems that interfere with work, driving, safety, or daily functioning
• Feeling unrefreshed despite spending enough time in bed

Snoring, gasping, and choking may be signs of obstructive sleep apnea. Persistent insomnia may also require targeted clinical treatment rather than sleep hygiene alone.

Simple Daily Sleep Plan

Morning

• Wake up at approximately the same time every day
• Get 20–30 minutes of natural light before 10 a.m.

During the day

• Exercise regularly
• Aim for approximately 150 minutes of moderate aerobic activity per week
• Stop caffeine around midday

Evening

• Finish large meals at least two hours before bed
• Limit alcohol
• Keep the bedroom dark, cool, quiet, and comfortable

Thirty minutes before bed

• Turn off screens
• Dim the lights
• Use breathing, mindfulness, or progressive muscle relaxation

At bedtime

• Spend five minutes writing a specific to-do list for the next day
• Aim for 7–9 hours of sleep
• Maintain the same wake-up time on weekdays and weekends

Summary / Key Takeaways

Improving sleep usually starts with consistent daily habits rather than a single supplement or quick fix.

✓ Sleep duration: Aim for 7–9 hours each night
✓ Consistency: Keep a regular bedtime and wake-up time
✓ Morning light: Get 20–30 minutes of sunlight before 10 a.m.
✓ Exercise: Work toward 150 minutes of moderate activity each week
✓ Sleep environment: Keep the bedroom dark, cool, quiet, and comfortable
✓ Evening habits: Reduce late caffeine, alcohol, screens, and heavy meals
✓ Mental relaxation: Use mindfulness, progressive muscle relaxation, or a five-minute to-do list
✓ Supplements: Consider magnesium, holy basil, or L-theanine only as additions to healthy sleep habits

Bottom line: Better sleep is built through consistency. Start with one or two manageable changes, practice them daily, and gradually add more habits as they become part of your routine.

Book a call with one of our health coaches today to learn more about improving your sleep and building a routine that supports your long-term health.

What your panel measures, and why it is enough

Your panel is built around the questions that matter: is your thyroid working at the right pace, and if it isn’t, then in which direction and by how much, and is an autoimmune process involved? Five core markers answer those questions clearly:

• TSH is the most sensitive early signal of how actively your thyroid is working, and it usually moves first, before the other markers shift.
• Free T4 is the main hormone your thyroid makes, and read alongside TSH it adds context to how the gland may be working.
• Free T3 is the active hormone that sets your metabolic pace, and it is most informative when your thyroid may be running fast.
• TPO and thyroglobulin antibodies can suggest whether an autoimmune process, such as Hashimoto’s or Graves’, may be involved.

Together, these markers give a clear picture of how your thyroid may be working, one that you and your doctor can use to decide on any next steps. That is the same core set thyroid specialists rely on, and every test in it earns its place by adding real insight rather than extra uncertainty.

What reverse T3 is

Your thyroid mostly produces T4, a storage form of the hormone that your body activates as needed. To use it, the body removes a single iodine atom from T4. Take it from one spot and you get T3, the active hormone that speeds your metabolism up. Take it from the other spot and you get reverse T3, an inactive look-alike that does nothing. One way to picture it: T4 is a dimmer switch, and the body can turn it up to T3 or leave it off as rT3. Both are normal, everyday products of a healthy thyroid.

Why reverse T3 rises, and why that usually isn’t a thyroid problem

Most of the time, a high reverse T3 has nothing to do with thyroid disease. When your body is under stress, during an illness, after surgery, while fasting or dieting, or under heavy physical strain, it deliberately steers more T4 toward inactive rT3 and less toward active T3. Doctors call this non-thyroidal illness, sometimes “euthyroid sick syndrome,” and the telling detail is in that name: euthyroid, meaning the gland itself is working normally. It is a sensible energy-saving response to a hard stretch, not a fault to correct. Some medications, including beta-blockers, steroids, and amiodarone, nudge the body the same way. So in an otherwise well person, a raised rT3 usually just reflects that the body has recently been stressed, unwell, or underfed.

Why we leave reverse T3 out of your panel

Put simply, reverse T3 would add noise rather than signal. Four reasons stand behind that.

It rarely reflects your thyroid. As above, a high rT3 usually tracks stress, illness, or fasting rather than a gland that is genuinely under- or over-active, so it is hard to interpret as a thyroid test at all.

It would not add anything to act on. Understanding an underactive thyroid rests on TSH, supported by Free T4. As one clinical review put it, there is “no rationale for measuring reverse T3” when starting or adjusting treatment, which is always best worked through with your doctor. A result that adds no useful information does not belong on the panel.

The test itself is shaky. Reverse T3 is a specialized assay that laboratories do not measure consistently, and it lacks validated reference ranges for this use. It cannot reliably tell true hypothyroidism apart from the harmless stress-related shift described above.

The popular “Free T3 to reverse T3 ratio” is not validated. You will see this ratio in some wellness circles, but there is no agreed cutoff, the “ideal” numbers swing widely from one source to the next, and the answer even depends on the units used. No major medical society backs it.

Specialists advise against it. The American Thyroid Association states plainly that, in healthy, non-hospitalized people, measuring reverse T3 “does not help determine whether hypothyroidism exists or not, and is not clinically useful.”

A note on “Wilson’s syndrome”

Reverse T3 testing often travels with a label called “Wilson’s temperature syndrome,” the idea that a low body temperature plus vague symptoms come from a conversion problem, supposedly fixable with T3. The American Thyroid Association looked at this directly, found “no scientific evidence” that it exists, and cautioned that the T3 regimens sold to treat it can affect the heart and bones and prove “potentially dangerous.” It is not something we build your care around.

Key takeaway

Your panel of TSH, Free T4, Free T3, and thyroid antibodies already covers what matters: it gives a clear, useful picture that you and your doctor can act on. Reverse T3 is a genuine molecule, but as a test it mostly reflects stress, fasting, or illness, it is not measured reliably, and it would not add anything you or your doctor would act on. Leaving it out is not a gap. It is what keeps your results clear and your decisions anchored to the markers that count.

Where to read more

• Understanding Your Thyroid Biomarkers: a closer look at each marker on your panel and how they fit together

This article is for general wellness and educational purposes only. It explains why reverse T3 is not part of the SiPhox panel; it is not medical advice, it is not a diagnosis, and it does not replace care from your own clinician. For decisions about thyroid testing or treatment, please speak with your doctor.

Sources: American Thyroid Association: Thyroid Function Tests, Statement on “Wilson’s Syndrome”, Clinical Thyroidology for the Public (Jan 2019); “Reverse T3 or perverse T3?” Cleveland Clinic Journal of Medicine (2018); Merck Manual: Euthyroid Sick Syndrome; The Non-Thyroidal Illness Syndrome, Endotext.

Why movement helps

When your thyroid is well managed, regular activity does just what you would hope: steadier energy, a brighter mood, easier weight control, and better protection for your heart and bones. Those happen to be the areas a thyroid imbalance tends to hit hardest, which is why movement is such a useful part of feeling like yourself again once your levels sit in a reasonable range.

If your thyroid is underactive (running slow)

An underactive thyroid slows your metabolism, so when it is undertreated you may feel tired, cold, and quick to run out of steam during exercise. The trick is not to force it. Start gentle and build up over time, with walking, light strength work, and easy cardio as good first steps.

Here is the encouraging part: as treatment brings your levels back to normal, energy and stamina usually climb with them, and activity then helps with any leftover fatigue and with weight. If you still feel wiped out by ordinary movement once things have settled, mention it to your clinician rather than pushing through.

If your thyroid is overactive (running fast)

This is where a little caution pays off. An overactive thyroid already keeps your body revved up, with a faster heartbeat and higher energy burn even at rest. Piling intense exercise on top of uncontrolled hyperthyroidism can strain the heart, raise the risk of irregular rhythms, and worsen overheating, anxiety, and poor sleep. Uncontrolled overactivity also drains muscle and speeds up bone loss.

So the order matters: it is best to have your levels well controlled first, which is something to work through with your doctor, and to hold off on high-intensity training until then. Check with your clinician before you start or restart a program, and once things are steady you can build back up safely.

Exercise supports your treatment, it does not replace it

Activity is a real tool for energy, mood, weight, and long-term heart and bone health. What it cannot do is take the place of getting your thyroid levels right in the first place. Treatment is the foundation, and movement is what you build on top of it, so the two work best together.

Simple ways to start

• Begin low: walking, gentle cycling, or light resistance work
• Add time or intensity slowly, as your energy allows
• Include some strength training to protect muscle and bone
• Listen to your body: unusual breathlessness, a racing heartbeat, or lasting exhaustion is your cue to ease off and check in with your clinician

Key takeaway

If your thyroid is running slow, start gently and let treatment rebuild your energy before you ramp up. If it is running fast, make sure it is well controlled, with your doctor’s guidance, before any intense exercise. Either way, movement is there to support your treatment, not to stand in for it.

Where to read more

• Hypothyroid vs Hyperthyroid Symptoms: how your symptoms and biomarkers fit together
• Eating Well for Thyroid Health: nutrition that supports your thyroid

This article is for general wellness and educational purposes only. It is not medical advice, it is not a diagnosis, and it does not replace care from your own clinician or a personalized exercise or treatment plan. Please get your clinician’s guidance before starting or changing an exercise program, and do not adjust any treatment on your own, especially if your thyroid levels are not yet controlled. If you have chest pain, a severe or irregular heartbeat, fainting, or breathlessness at rest, stop and seek medical care.

Sources: Cleveland Clinic: Exercise and an Uncontrolled Thyroid; American Thyroid Association: Hyperthyroidism, Hypothyroidism.

Why food matters for your thyroid

Your thyroid runs on nutrients from what you eat. It uses iodine to build thyroid hormone, then relies on a handful of other nutrients to activate and protect it. Get enough of the right ones, without overdoing it, and the gland has what it needs. For most people that comes from everyday balanced meals, not from a stack of pills.

Iodine: enough, but not too much

Iodine is the one nutrient your thyroid cannot do without, since it is the raw material for its hormones. The important nuance is that both too little and too much can cause problems, so the aim is a steady, adequate intake rather than the highest amount you can manage.

Most people who use iodized salt get plenty from ordinary foods like dairy, eggs, and seafood. Adults need about 150 micrograms a day, and a little more in pregnancy. The usual source of trouble is the opposite of deficiency: high-dose iodine or kelp and seaweed products, which can deliver many times a safe amount and tip the gland off balance. Unless your clinician has recommended it, there is no need to add iodine, and kelp supplements are best left on the shelf.

Selenium: the quiet helper

Selenium helps your body switch thyroid hormone into its active form and shields the gland from everyday wear, so getting enough matters. More is not better, though. A few studies hint that selenium supplements can slightly lower thyroid antibodies in Hashimoto’s, but the evidence is mixed, does not clearly help people feel better, and is not something major guidelines recommend across the board. Selenium also has a narrow safe range. The simplest approach is to get it from food, where a couple of Brazil nuts already cover a full day, and to add a supplement only in discussion with your clinician.

Iron, zinc, and vitamin D: the supporting cast

A few other nutrients play backup. Iron powers the enzyme that makes thyroid hormone, and running low on it often accompanies an underactive or autoimmune gland, so it is worth checking if you feel tired a lot. Zinc helps your body process thyroid hormone. Vitamin D tends to run low in people with autoimmune thyroid conditions, though that is a link rather than proof a supplement fixes anything. For all three, aim for enough through a varied diet, and correct a genuine shortfall only if you have one.

Broccoli, kale, and soy are fine

You may have heard that cruciferous vegetables like broccoli, cabbage, and kale, along with soy, are “goitrogens” that harm the thyroid. In the amounts people normally eat, they are safe, and cooking softens any effect even further. The theoretical worry only applies alongside iodine deficiency or genuinely extreme habits, such as drinking large amounts of raw cruciferous juice daily. These are nutritious foods, so keep them on your plate as part of a varied diet.

If you take levothyroxine: keep the timing steady

If you take levothyroxine, food and some supplements can affect how much your body absorbs. The notes below are general background, not instructions for your dose, so keep taking your medication exactly as prescribed and check any timing questions with your doctor or pharmacist. As a rule of thumb, levothyroxine is usually absorbed best on an empty stomach; coffee and soy-heavy meals are kept a little apart from it; and calcium or iron supplements are spaced several hours away, because they can bind it. Whatever schedule you settle on with your clinician, keeping it the same each day is the part that helps most.

The bottom line: a balanced, whole-food pattern

No single food makes or breaks thyroid health. What the evidence keeps pointing to is an overall pattern: plenty of vegetables and fruit, quality protein, whole grains, and enough (not extra) iodine, selenium, iron, zinc, and vitamin D. One myth worth retiring is going gluten-free to help thyroid disease. On its own it does not, and it only makes a difference if you also have celiac disease, which is worth ruling out if you have symptoms of it, since the condition turns up more often in people with autoimmune thyroid conditions.

Key takeaway

Get enough iodine without going overboard, aim for a solid baseline of selenium, iron, zinc, and vitamin D from food, and keep broccoli and soy on your plate. If you take medication, hold its timing steady and separate from coffee, calcium, and iron. A consistent, balanced diet will do far more for your thyroid than any restrictive plan.

Where to read more

• Understanding Your Thyroid Biomarkers: what each marker means in your report
• Preparing for Your Thyroid Test: how to get a clean, accurate result
• Staying Active & Thyroid Health: movement that supports your thyroid

This article is for general wellness and educational purposes only. It is not medical advice, it is not a diagnosis, and it does not replace care from your own clinician. Do not start, stop, or change any supplement or medication based on it. Individual needs vary, so please speak with your doctor, pharmacist, or a registered dietitian before making major dietary changes or starting supplements.

Sources: NIH Office of Dietary Supplements: Iodine, Selenium; American Thyroid Association: Statement on Excess Iodine, Selenium & Hashimoto’s; Harvard Nutrition Source: Iodine; Mayo Clinic: hypothyroidism diet & levothyroxine; AAFP/FPIN: gluten-free diet & thyroid disease.

Why eating well matters more on a GLP

When you are eating less, every meal carries more weight. There is less room for empty calories, and a higher chance of missing out on protein, vitamins, and minerals without meaning to. Eating well on a GLP is less about eating less, which the medication already helps with, and more about making each meal count. Do that, and you protect your energy, your mood, and the quality of your results.

Put protein first

Protein is the single most important part of your plate on a GLP. When you lose weight quickly, some of that loss can come from muscle rather than fat. Getting enough protein, alongside a little resistance training, helps keep the weight you lose mostly fat. A simple approach:

• Include a protein source at every meal and snack
• Eat your protein first, before the rest of the plate, while your appetite is small
• Reach for easy options like eggs, Greek yogurt, fish, chicken, tofu, beans, lentils, and protein shakes when cooking feels like too much

If you find it hard to hit your protein from food alone, a shake or supplement can fill the gap. Our guide to choosing a protein supplement can help you pick one.

Make every meal count

With smaller portions, nutrient-dense food does the heavy lifting. Build meals around whole foods: vegetables, fruit, whole grains, and good fats, with protein at the center. Try not to skip meals even on days when you are not very hungry. Regular, smaller meals keep your energy steady and help you meet your nutrition needs without forcing large plates you do not want.

Stay hydrated

GLP medications can quietly turn down your thirst, and dehydration is one of the most common issues early on. It can also make side effects like nausea, headaches, and fatigue feel worse. Keep a water bottle nearby and sip through the day rather than waiting until you feel thirsty. If you are sweating a lot or feeling lightheaded, adding electrolytes can help.

Eat gently to ease side effects

Nausea, fullness, and an unsettled stomach are common in the early weeks. A few habits make a real difference:

• Eat smaller amounts more often, and slow down
• Go easy on very greasy, fried, or rich foods while you adjust
• Choose plain, simple foods like crackers, rice, broth, or bananas on queasy days
• Stop when you feel comfortably full, not stuffed

Most of this settles as your body adjusts. If it does not, your doctor can help.

Mind your micronutrients

Eating less can gradually lower key nutrients like iron, vitamin B12, vitamin D, and folate. Low levels here often show up as tiredness or brain fog, which can be easy to mistake for the medication itself. Eating a varied diet helps, and your SiPhox labs will flag any gaps so you and your coach can act early. A supplement may be worth discussing if a marker drifts low.

Build habits that last

The eating habits you build now are the ones that will carry you through maintenance and beyond, including if you taper off your medication later. Keep it simple and repeatable: plan a few go-to high-protein meals, keep easy snacks on hand, and aim for consistency rather than perfection.

Key takeaway

On a GLP, eating well is less about eating less and more about making every bite count. Lead with protein, stay hydrated, keep your meals nutrient-dense, and go gently when side effects flare. Small, steady habits are what protect your muscle, your energy, and your results.

Where to read more

• Protein supplements: choosing the best option for your health
• The minimum effective workout plan for maintaining muscle
• GLP Titration Phase: what to expect early on

This article is for general wellness and educational purposes and is not medical advice. For anything specific to your health or your medication, please speak with your doctor.

This guide explains our testing methods, reporting practices, and recommendations for obtaining reliable results.

Laboratory Standards & Accreditation

CLIA/CAP-Certified Testing

All laboratory testing is performed according to rigorous quality standards required for CLIA and CAP-certified laboratories.

These standards ensure that:

• Testing methods are validated before use
• Quality control procedures are continuously monitored
• Results are reported only within validated analytical ranges
• Laboratory processes meet established regulatory requirements

Because of these standards, certain calculated values may not be reported if underlying measurements fall outside validated ranges.

Method Validation

Our assays undergo validation to ensure accuracy, precision, and reliability. Capillary collection methods are also validated against traditional venous blood collection where applicable.

For estradiol testing, the EasyDraw capillary collection method has been validated against venous serum testing using the same analytical methodology.

Hormone Testing Methods

Estradiol (Sensitive E2)

Testing Method

Sensitive estradiol testing is performed using LC-MS/MS (Liquid Chromatography-Tandem Mass Spectrometry).

LC-MS/MS is considered the gold standard for low-level estradiol measurement because it provides excellent specificity and minimizes interference that can occur with some immunoassays.

Detection Range

The lower limit of detection (LLOD) for estradiol is: 48 pg/mL

Values below this threshold may not be accurately quantified.

Validation Data

Detailed internal validation studies, assay correlation analyses, and proprietary performance metrics are not publicly available.

Total Testosterone

Testing Method

For EasyDraw collections, total testosterone is measured using an immunoassay-based method.

Upper Reporting Limit

The assay reports testosterone concentrations up to: 2,000 ng/dL

Results above this range are reported as: > 2,000 ng/dL

Samples exceeding this limit are not automatically diluted and re-analyzed to provide a higher numerical result.

Free Testosterone

Direct Measurement vs Calculation

Free testosterone is calculated, not directly measured through equilibrium dialysis.

The calculation incorporates:

• Total Testosterone
• SHBG (Sex Hormone-Binding Globulin)
• Albumin

This approach is commonly used in clinical practice and provides an estimate of biologically active testosterone.

Free Androgen Index (FAI)

The Free Androgen Index (FAI) is also calculated using total testosterone and SHBG values.

Formula: FAI = ((Total Testosterone × 0.0347) ÷ SHBG) × 100

Understanding Your Results

Why Are Some Calculated Values Missing?

In some cases, Free Testosterone or FAI may not appear on your report.

This occurs when SHBG or Total Testosterone falls outside the laboratory’s validated reporting range.

To maintain compliance with laboratory quality standards and ensure accurate reporting, calculated values cannot be displayed when underlying measurements fall outside validated parameters.

Why Do Results Sometimes Differ Between Laboratories?

Differences between laboratories are common and do not necessarily indicate an error.

Potential causes include:

Different Testing Methods

• LC-MS/MS vs immunoassay
• Different instrument platforms
• Different calibration standards

Sample Type

• Capillary blood
• Venous blood

Biological Variation

Hormone levels naturally fluctuate throughout the day and can be influenced by:

• Sleep quality
• Stress
• Exercise
• Illness
• Nutrition
• Hydration
• Alcohol intake
• Medications and supplements

For this reason, trends over time are often more informative than a single isolated result.

Best Practices for TRT Testing

Standardized Blood Collection Conditions

For reliable and comparable results, blood samples should be collected under consistent conditions:

• Morning collection (ideally before 10:00 AM)
• Fasting state (8–12 hours, no calories)
• Before applying testosterone gel/cream (if applicable)
• Same relative timing within the injection cycle each time
• After a normal night’s sleep
• No intense exercise immediately before testing

Injectable Testosterone

Testosterone levels fluctuate across the injection cycle, with higher levels shortly after dosing and lower levels just before the next injection.

• Testing around 7 days post-injection generally reflects a near-trough level in many weekly dosing protocols
• Testing 10–14 days post-injection may underestimate typical on-treatment exposure depending on dose and frequency
• Choose one consistent timepoint in your cycle and use it for all follow-up testing (commonly trough, just before the next dose)

Testosterone Gels and Creams

For transdermal therapy:

• Collect the blood sample before applying the daily dose
• Keep application timing consistent between tests where possible

Factors That Can Affect Results

Results may vary due to short-term physiological and external influences, including:

• Acute illness
• Sleep disruption
• Alcohol intake
• Recent intense exercise
• Hydration status

These factors can shift hormone levels temporarily and should be avoided when possible for baseline monitoring.

TRT Monitoring Principles

• Use consistent sampling conditions and timing to ensure comparability
• Focus on trends over time rather than single measurements
• Interpret results alongside symptoms and lifestyle context
• Differences between assays (e.g., LC-MS/MS vs immunoassay) and sample types (capillary vs venous) can affect absolute values
• Minor variability between tests is expected and does not necessarily indicate a clinically meaningful change

Where can I learn more?

• https://www.aafp.org/afp/2017/1001/p441
• https://www2.gov.bc.ca/gov/content/health/practitioner-professional-resources/bc-guidelines/testosterone-testing

But beneath these headline results sits a more nuanced clinical reality:

Weight loss on GLP therapy is not exclusively fat loss.

Across trials and metabolic studies, a consistent finding emerges; a meaningful proportion of total weight reduction includes lean mass, particularly in individuals who do not actively engage in resistance training or maintain adequate protein intake.

This is not a flaw of the medication. It is a physiological consequence of energy restriction without sufficient stimulus.

And it leads to an important distinction:

GLPs determine how much weight you lose. Lifestyle determines what that weight consists of.

Why Muscle Loss Matters More Than Most People Realize

Skeletal muscle is not simply structural tissue. It is metabolically active, insulin-sensitive, and central to long-term energy regulation.

Loss of lean mass during weight reduction has been associated with:

• Lower resting metabolic rate
• Reduced insulin sensitivity
• Increased risk of weight regain
• Declines in physical function and strength

In the context of obesity pharmacotherapy, this is particularly relevant. Post-treatment weight regain is common once medication is discontinued, and reduced muscle mass is one of the strongest predictors of rebound weight gain.

This is why modern obesity guidelines, including those from the American Diabetes Association and Endocrine Society, emphasize preservation of lean mass during weight loss interventions, not just absolute weight reduction.

Resistance Training: The Primary Protective Signal

If there is one intervention that consistently changes body composition outcomes during weight loss, it is resistance training. Not cardio. Not calorie restriction. Not supplements.

Resistance training provides a direct physiological signal that tells the body:

“This tissue is needed.”

Without that signal, the body has no reason to prioritize muscle preservation in a calorie deficit.

What This Looks Like in Practice

In clinical reality, adherence matters more than program complexity.

The most effective structure is simple:

3 sessions per week (ideal)

or

2 sessions per week (minimum effective dose)

Each session should include five movement patterns:

• A squat pattern (leg press or squat)
• A hip hinge (deadlift or hip thrust)
• A push movement (bench press or push-ups)
• A pull movement (rows or lat pulldown)
• A core stability movement (planks or loaded carries)

The key variable is not exercise selection: it is progressive overload over time, even modestly.

A practical benchmark is effort-based:

• The last 1–2 repetitions of each set should feel challenging but controlled

This is sufficient to preserve and improve lean mass during GLP-induced weight loss.

Daily Movement: The Underestimated Variable

Beyond structured training lies a more subtle driver of metabolic health: non-exercise activity thermogenesis (NEAT).

This includes:

• Walking
• Standing
• Postural movement
• Low-intensity daily activity

Research from Levine et al. has demonstrated that NEAT can vary by more than 2,000 kcal/day between individuals of similar size, making it one of the most variable components of total energy expenditure.

Practical application

A realistic target is:

• 7,000–10,000 steps per day

But more importantly:

• Short walks after meals (10–15 minutes)
• Breaking prolonged sitting every 60–90 minutes
• Walking during calls or low-intensity tasks

These are small behaviors with disproportionately large metabolic effects.

Protein Intake: The Second Critical Pillar

If resistance training is the “signal” to preserve muscle, protein is the “building material.”

During energy restriction, inadequate protein intake is strongly associated with:

• Increased lean mass loss
• Reduced satiety
• Higher likelihood of diet discontinuation

Evidence-based target

Most clinical literature supports:

0.7-1.0 g/Ib/day of protein during weight loss phases

Practical translation

Rather than calculating totals, the most reliable approach is:

• 25–35 g protein per meal
• 3–4 meals per day
• Protein distributed evenly across the day

The Central Clinical Insight

Across obesity pharmacotherapy trials, a consistent pattern emerges:

• Medication drives weight loss magnitude
• Resistance training determines body composition
• Protein intake determines muscle preservation
• Daily activity determines metabolic stability

Takeaway

The goal of GLP therapy should not be simply weight loss.

It should be:

• Fat loss with muscle preservation
• Metabolic improvement without functional decline
• A transition into a body that is not only lighter, but stronger and more resilient

In that sense, exercise and protein are not adjuncts to pharmacotherapy.

They are what determine whether the outcome of treatment is merely weight reduction or genuine metabolic transformation.

Read More:

https://pmc.ncbi.nlm.nih.gov/articles/PMC12683586/

https://health.clevelandclinic.org/exercise-for-glp-1-use

https://www.endocrinedirectcarephysicians.com/post/optimal-daily-protein-intake-and-strength-training-tips-for-glp-1-medication-users-to-preserve-muscl

Symptoms and Biomarkers Work Together

A biomarker is something we measure in your blood, such as triglycerides or vitamin B12. A symptom is something you notice or feel, such as nausea or low energy. Biomarkers show what’s happening inside your body; symptoms show how it feels day to day. Together they give a clearer picture than either one alone, which is why your check-ins ask about both.

Non-Specific Symptoms

Non-specific symptoms are common and can have many causes, so on their own they don’t point to any single problem. On a GLP, the usual ones include:

• Tiredness or low energy
• Mild nausea
• Headache
• Dizziness
• Brain fog
• Changes in appetite or mild stomach upset

These often appear as your body adjusts, especially in the early weeks while your dose is increasing, and tend to ease with time, hydration, and regular meals. We still track them because patterns matter: ongoing tiredness on its own is vague, but tiredness alongside a low vitamin B12 result tells a clearer story.

Specific Symptoms

Specific symptoms point more clearly to one cause or body system. They’re less common, and a few are worth flagging early so they can be checked. Examples include:

• Severe stomach pain, especially high up and spreading to the back, which can relate to the pancreas
• Pain in the upper-right abdomen after meals, or yellowing of the skin or eyes, which can relate to the gallbladder
• Ongoing vomiting or being unable to keep fluids down, which can signal dehydration

These are uncommon, but because each points to something specific, your report treats them differently from the more common, for example, dips in energy, that many people notice from time to time.

How Your Report Uses Them

Your symptoms are scored for severity and combined with your lab results and body composition to produce your overall tolerance score. The two types are used differently:

• Non-specific symptoms can add context. They importantly let us know how you are feeling overall.
• Specific symptoms can point to a more specific cause related to the GLP medication.

Most of these will also come and go, especially when starting or increasing your dose. However, it is important that if you have any concerns you check in with your doctor.

In terms of scoring, the balance shifts as you go. Early on, while your body is adjusting, your report leans more on your symptoms; later, in maintenance, it leans more on your biomarker trends.

What This Means For You

• Log your symptoms, including the small ones, and note whether each is steady, easing, or worsening.
• Most non-specific symptoms come with adjusting and settle on their own; hydration and regular meals usually help.
• If a symptom feels severe or worrying, or matches a specific symptom above, check in with your doctor. Our Contraindications and Discontinuation Guidelines list the signs that need urgent care.

Key Takeaway

Non-specific symptoms are common and usually part of adjusting. Specific symptoms are less common and can point to something more particular. Tracking both, in your own words, helps keep your plan safe, personal, and useful.

Where to Read More

• Contraindications and Discontinuation Guidelines
• GLP Titration Phase: tracking symptoms and biomarkers early on
• GLP Maintenance Phase: tracking biomarkers long term

This article is for general wellness and educational purposes and isn’t medical advice. If you’re worried about a symptom or unsure how serious it is, contact your doctor or seek urgent care.

If you do not have a recent DEXA or other body composition scan, or if you are unable to access those results, you may continue with this alternative option.

Accurate and standardized measurements are essential. Even small differences in technique can lead to large variations in results, so please follow the instructions carefully.

What You Need

• A soft, flexible measuring tape (tailor’s tape)
• A mirror (optional but helpful)
• Light, fitted clothing or minimal clothing
• A relaxed standing posture

Required Measurements

Participants should provide:

• Height
• Weight
• Neck circumference
• Chest circumference
• Waist circumference
• Hip circumference

Each measurement should be taken twice, and the average recorded.

1. Height

How to measure:

• Stand barefoot on a flat surface (no shoes)
• Stand straight with heels together
• Keep head level (looking forward, not up or down)
• Measure from the floor to the top of the head

Tips:

• Stand against a wall for accuracy
• Ensure heels, back, and head are aligned if possible

2. Weight

How to measure:

• Use a digital scale on a hard, flat surface (not carpet)
• Weigh yourself without shoes
• Preferably measure in the morning before eating

Tips:

• Avoid holding objects while weighing
• Try to measure at a consistent time of day

3. Neck Circumference

Why it matters:

Neck circumference helps estimate upper-body fat distribution and is a useful indicator in overall body composition profiling.

How to measure:

• Stand upright with shoulders relaxed
• Place the tape just below the Adam’s apple (or midpoint of the neck)
• Wrap the tape around the neck horizontally
• Ensure it is snug but not compressing the skin

Key tips:

• Do not tilt your head up or down
• Keep shoulders relaxed, not raised

4. Chest Circumference

Why it matters:

Chest measurement reflects upper torso size and helps assess muscle and fat distribution in the upper body.

How to measure:

• Wrap the tape around the fullest part of the chest
• Typically, across the nipple line
• Arms should be relaxed at your sides
• Stand naturally without expanding or holding breath

Key tips:

• Do not puff out your chest
• Keep the tape level all the way around

5. Waist Circumference

Why it matters:

Waist circumference is one of the strongest indicators of central fat distribution and metabolic risk.

How to measure:

• Locate the narrowest part of your torso (or midway between ribs and hips if unclear)
• Wrap the tape around your waist horizontally
• Keep it snug but not tight

Key tips:

• Do not suck in your stomach
• Stand relaxed and breathe normally
• Ensure the tape is level all the way around

6. Hip Circumference

Why it matters:

Hip measurement reflects lower-body fat and muscle distribution and is important for body shape and ratio analysis.

How to measure:

• Stand with feet together
• Wrap the tape around the widest part of your hips and buttocks
• Ensure the tape is level and straight

Key tips:

• Do not tilt your hips forward or backward
• Check in a mirror if possible to ensure even placement

Important General Guidelines

To ensure the highest quality data:

• Take all measurements standing in a relaxed posture
• Use the same tape for all measurements
• Measure directly against the body (not over thick clothing)
• Keep the tape level and parallel to the floor
• Avoid pulling the tape too tight or leaving it too loose
• If unsure, repeat the measurement and record the average

Data Consistency Matters

These measurements are used to track changes over time and across individuals. Small differences in technique can significantly affect interpretation, so consistency is more important than precision.

We recommend that participants:

• Measure themselves at the same time of day when possible
• Use the same method each time
• Follow the same sequence of measurements

Summary

Our protocol combines six key body measurements (neck, chest, waist, hip, height, and weight) to create a reliable, standardized dataset when 3D scanning is not available. Together, these measurements provide a strong foundation for analyzing body composition patterns and tracking changes over time.

References:

https://elht.nhs.uk/services/dietetics/body-measuring-techniques

https://www.measurement-toolkit.org/anthropometry/objective-methods/simple-measures-circumference

https://renpho.com/blogs/wellness-fitness-blog/heres-all-you-need-to-know-about-body-tape-measurements?srsltid=AfmBOopMMp2zu8yBn26uhVlPGlQHLkdhnw6ZI829c2cAwhTT6_agDqpw

• Evidence-based guidance on contraindications for GLP-1 receptor agonists (e.g. semaglutide, liraglutide, dulaglutide) and the dual GIP/GLP-1 receptor agonist tirzepatide, and when to review treatment
• A clear list of urgent symptoms that warrant immediate medical attention
• Contraindications that are generally treatment-limiting (absolute) versus those requiring case-by-case medical evaluation (relative)
• Pregnancy, contraception, and breastfeeding considerations, including medication-specific washout periods
• Risks related to pancreatitis, gallbladder, kidney, and gastrointestinal conditions
• Thyroid and genetic safety warnings (MTC, MEN2)
• Allergy and hypersensitivity risks
• Key medication interaction considerations, including absorption-related contraceptive interactions
• Peri-procedure and anaesthesia considerations
• Guidance on safe use and speaking with a prescribing physician

A Note on Terminology

In this article we refer to “GLP-1 and GLP-1/GIP medications” to reflect the fact that the most commonly prescribed agents in this group have different mechanisms. Semaglutide (Ozempic, Wegovy, Rybelsus), liraglutide (Victoza, Saxenda), and dulaglutide (Trulicity) act on the GLP-1 receptor only. Tirzepatide (Mounjaro, Zepbound) acts on both the GLP-1 and the GIP (glucose-dependent insulinotropic polypeptide) receptors. Where a recommendation is specific to one medication or to a subset of this class, we note that explicitly.

Our Commitment to User Safety

At SiPhox, we understand that GLP-1 and GLP-1/GIP medications can play an important role in supporting weight management and metabolic health goals. At the same time, user safety must always come first.

We believe it is important for individuals using these medications to fully understand potential contraindications, risks, and warning signs associated with treatment.

Evidence-Based Guidance on Contraindications and Treatment Discontinuation

Below is a summary of contraindications and safety considerations for GLP-1 receptor agonists and tirzepatide as described in current clinical literature and prescribing guidelines.

These recommendations are based on published medical evidence and are intended to help users better understand situations in which treatment may not be appropriate or may require closer medical supervision.

While this information can support awareness and informed decision-making, it is not a substitute for individualised medical evaluation. If a user believes any of these contraindications may apply to them, or is considering stopping their medication for any reason, they should first speak with their prescribing physician.

A licensed clinician is best positioned to interpret these guidelines in the context of the user’s full medical history and determine whether continuation, adjustment, or discontinuation of therapy is appropriate and safe.

When to Seek Urgent Medical Attention

Most side effects of GLP-1 and GLP-1/GIP medications are mild and resolve as the body adjusts. However, certain symptoms can indicate serious complications and should be treated as medical emergencies. Users should seek immediate medical assessment — typically through emergency services or the nearest emergency department — if they experience any of the following:

Possible pancreatitis

• Severe, persistent abdominal pain, particularly in the upper abdomen
• Pain radiating to the back
• Severe or persistent nausea or vomiting, especially when combined with abdominal pain
• Abdominal pain accompanied by fever or marked abdominal tenderness

Severe allergic or hypersensitivity reaction

• Swelling of the face, lips, tongue, or throat
• Difficulty breathing, wheezing, or tightness in the throat
• Widespread rash, hives, or severe itching
• Dizziness, fainting, or rapid heartbeat following injection

Severe gastrointestinal symptoms or dehydration

• Persistent vomiting or inability to keep fluids down for more than 24 hours
• Signs of dehydration: marked thirst, dark urine, very reduced urine output, dizziness on standing, confusion, or rapid heartbeat
• Severe diarrhoea, particularly if combined with vomiting

Possible gallbladder complications

• Sudden, severe upper-right or central abdominal pain, especially after meals
• Pain radiating to the right shoulder or back
• Fever combined with abdominal pain
• Yellowing of the skin or eyes (jaundice)
• Pale stools or dark urine

Possible kidney injury

• A significant drop in urine output
• New or worsening swelling in the legs or ankles
• Confusion or marked fatigue, particularly in the context of vomiting or diarrhoea

If a user is unsure whether their symptoms are serious, the safest course is to seek medical assessment rather than wait. Users should not stop their medication on their own without first speaking with their prescribing physician unless instructed to do so in an emergency setting.

Contraindications:

Situations in which taking GLP medications is strongly discouraged, or where the medication should be stopped immediately if already in use.

This recommendation is based on the potential for clinically significant health risks that should be reviewed with your Primary Care Physician (PCP) prior to initiating or continuing this medication. If you have any concerns or develop new symptoms, please consult your PCP before making changes to your treatment plan. The following contraindications and precautions may include, but are not limited to, the conditions listed below:

1. Personal or Family History of Medullary Thyroid Carcinoma (MTC)

Most medications in this class — including semaglutide, liraglutide, dulaglutide, exenatide extended-release, and tirzepatide — carry a U.S. boxed warning relating to the potential risk of thyroid C-cell tumours. This warning is based on preclinical animal studies in which sustained exposure to certain GLP-1 receptor agonists was associated with the development of these tumours. While the direct risk in humans has not been definitively established, this precaution is well recognised in medical literature, prescribing information, and clinical guidelines.

Because of this established safety concern, these medications are generally considered contraindicated in users with:

• A personal history of MTC
• A family history of MTC

Healthcare providers are advised to carefully review a patient’s personal and family medical history before initiating treatment. Users should also promptly report symptoms that could suggest thyroid-related complications, including:

• A lump or swelling in the neck
• Persistent hoarseness
• Difficulty swallowing
• Shortness of breath

2. Multiple Endocrine Neoplasia Syndrome Type 2 (MEN2)

MEN2 is a hereditary endocrine disorder associated with a significantly increased risk of developing medullary thyroid carcinoma and other endocrine tumours. Because individuals with MEN2 already carry an elevated baseline risk for thyroid C-cell abnormalities, GLP-1 and GLP-1/GIP medications are generally considered contraindicated in this population.

This precaution is widely recognised in clinical practice and is included in FDA labelling and prescribing guidance for several medications in this class. Before prescribing treatment, healthcare providers typically assess for any known personal or family history of MEN2 or related endocrine cancers.

Users with MEN2 or suspected MEN2 should discuss all treatment options carefully with their endocrinologist or prescribing physician. In many cases, alternative therapies may be considered more appropriate depending on the patient’s overall medical history and risk profile.

3. History of Severe Hypersensitivity

A prior severe allergic or hypersensitivity reaction to a specific GLP-1 or GLP-1/GIP medication represents a strict contraindication to continued use of that medication and, in some cases, related medications within the same class. Although severe reactions are uncommon, they are well documented in medical literature and post-marketing safety reports.

Serious hypersensitivity reactions may include:

• Facial or throat swelling (angioedema)
• Difficulty breathing
• Severe rash or hives
• Anaphylaxis

Because allergic reactions can rapidly become life-threatening, users experiencing symptoms suggestive of a severe reaction should seek immediate medical attention (see urgent warning section above). Healthcare providers should also review any previous medication allergies or reactions before initiating therapy.

Even if symptoms appear mild initially, recurrent exposure after a significant hypersensitivity reaction may increase the risk of a more severe response in the future. For this reason, careful medical evaluation is essential before restarting or switching medications within this class after any suspected allergic event.

4. Pregnancy, Pregnancy Planning and Contraceptive Health

GLP-1 and GLP-1/GIP medications are not recommended during pregnancy. Human safety data are limited and animal studies of several agents in this class have demonstrated adverse fetal outcomes, including reduced fetal growth and developmental abnormalities at clinically relevant exposures. Intentional weight loss is also not recommended during pregnancy because it offers no benefit to a pregnant patient and may cause fetal harm.

A defining feature of these medications is their extended duration of action, which is why preconception planning is especially important. Recommended washout periods vary by medication because half-lives differ substantially:

• Semaglutide (Ozempic, Wegovy, Rybelsus) — half-life approximately 1 week. The FDA label recommends discontinuation at least 2 months before a planned pregnancy.
• Tirzepatide (Mounjaro, Zepbound) — half-life approximately 5 days. The FDA label recommends discontinuation at least 1 month before a planned pregnancy; some reproductive medicine literature suggests 25–35 days is a reasonable minimum, with longer intervals where feasible.
• Liraglutide (Victoza, Saxenda) — half-life approximately 13 hours. Discontinuation at least 3 days before conception is generally considered sufficient based on its pharmacokinetics.
• Dulaglutide (Trulicity) — long half-life of approximately 5 days; discontinuation roughly 1 month before conception is often recommended.

If a user becomes pregnant while taking any of these medications, the medication should be discontinued and the prescribing physician contacted promptly. The presence of the drug in early pregnancy is not, in itself, considered an indication for pregnancy termination, but it should be reviewed with an obstetric clinician. Several manufacturers maintain pregnancy exposure registries that users and their providers may wish to contact.

Recommendations:

• Users planning pregnancy should discuss the timing of medication discontinuation with their healthcare provider well in advance of trying to conceive
• Users who become pregnant while taking any medication in this class should notify their prescribing physician as soon as possible
• Alternative diabetes or metabolic management strategies may be recommended during pregnancy depending on the individual’s clinical needs

Contraception (Important for Tirzepatide)

Because GLP-1 and GLP-1/GIP medications slow gastric emptying, the absorption of orally administered drugs — including oral contraceptive pills — may be reduced, particularly early in treatment and after each dose increase.

This is most explicitly addressed in the FDA labels for tirzepatide (Mounjaro and Zepbound), which advise that users of oral hormonal contraceptives:

• Switch to a non-oral contraceptive method (e.g. intrauterine device, contraceptive implant, injection, patch, or vaginal ring), or
• Add a barrier method of contraception (e.g. condoms)
• For 4 weeks after initiating tirzepatide and for 4 weeks after each dose escalation

Non-oral hormonal methods are not expected to be affected by tirzepatide and do not require backup contraception based on this mechanism.

For other medications in this class (e.g. semaglutide, liraglutide), the prescribing labels do not contain an equivalent specific recommendation. However, because the underlying mechanism — delayed gastric emptying — is shared across the class to varying degrees, some clinicians take a similar precautionary approach during dose initiation and escalation, particularly for users in whom an unplanned pregnancy would be a significant concern. Users should discuss contraception planning with their prescribing physician.

Moderate / Relative Contraindications

The following conditions are considered moderate or relative contraindications. Treatment may still be appropriate in certain cases, but additional medical evaluation, monitoring, and risk-benefit assessment are often necessary.

Clinical decisions should always be individualised based on the user’s medical history, current health status, laboratory findings, and guidance from their prescribing physician.

1. Breastfeeding

There are currently insufficient human data to determine whether GLP-1 or GLP-1/GIP medications are excreted into breast milk or how they may affect a nursing infant. The FDA labels for both tirzepatide and semaglutide note that data are absent or limited in this area. Because of the limited evidence, caution is generally advised during breastfeeding.

Healthcare providers must weigh the potential benefits of treatment for the mother against any theoretical risks to the infant. In some situations, alternative therapies with more established safety data during lactation may be preferred.

Additional factors that may influence decision-making include:

• The age and health status of the infant
• The mother’s metabolic or diabetes-related health needs
• The severity of obesity-related medical conditions
• Whether the medication is being used primarily for weight management or glycaemic control

Recommendations:

• Users should discuss breastfeeding plans with their prescribing physician before starting or continuing therapy
• Careful monitoring and individualised medical guidance are recommended if treatment is continued during lactation

2. History of Pancreatitis

Cases of acute pancreatitis have been reported in individuals taking GLP-1 and GLP-1/GIP medications. A definitive causal relationship has not been fully established, and large randomised trials have not consistently shown an increased risk. Nonetheless, because pancreatitis can become severe and potentially life-threatening, caution is advised in users with a prior history of pancreatic disease or other significant risk factors.

Symptoms of pancreatitis may include:

• Severe or persistent abdominal pain
• Pain radiating to the back
• Nausea and vomiting
• Fever or abdominal tenderness

Pancreatitis is uncommon but potentially serious. Users who develop severe, persistent abdominal pain — particularly with nausea or vomiting — should seek urgent medical assessment.

Users with the following risk factors may require closer monitoring:

• Prior pancreatitis
• Gallstones or biliary disease
• Heavy alcohol use
• Elevated triglyceride levels, particularly severe hypertriglyceridaemia (commonly defined as triglyceride levels above 500 mg/dL, and especially above 1,000 mg/dL)
• Certain metabolic or gastrointestinal disorders that may increase pancreatic stress or inflammation risk, including:
  • Poorly controlled type 2 diabetes
  • Obesity associated with metabolic syndrome
  • Active gallbladder disease or gallstones
  • Inherited lipid disorders, such as familial hypertriglyceridaemia

Users with these risk factors may require closer clinical monitoring and individualised evaluation before initiating or continuing therapy.

3. Severe Gastrointestinal Disease (e.g. Gastroparesis)

GLP-1 and GLP-1/GIP medications work in part by slowing gastric emptying, which contributes to appetite reduction and improved blood sugar control. However, this same mechanism may worsen symptoms in users with underlying gastrointestinal motility disorders such as gastroparesis.

In severe cases, delayed gastric emptying can interfere with hydration, nutrition, and the absorption of other oral medications. Because gastrointestinal side effects are among the most common adverse effects associated with this class, users with pre-existing digestive disorders often require careful assessment before treatment initiation.

Healthcare providers may consider:

• Lower starting doses
• Slower dose escalation
• Alternative medications
• Ongoing symptom monitoring

Users experiencing severe or worsening gastrointestinal symptoms — particularly persistent vomiting, inability to keep fluids down, or signs of dehydration — should contact their healthcare provider promptly or seek urgent care (see urgent warning section above).

4. Chronic Kidney Disease

Some GLP-1 and GLP-1/GIP medications may require caution in users with moderate to severe kidney impairment, particularly those at risk for dehydration or acute kidney injury. While several agents in this class can be used safely in certain stages of chronic kidney disease, severe gastrointestinal side effects such as vomiting or diarrhoea may worsen kidney function due to fluid loss and electrolyte imbalance.

Users with advanced kidney disease may be more vulnerable to:

• Dehydration
• Acute kidney injury
• Electrolyte abnormalities
• Reduced medication tolerance

Clinical monitoring may include:

• Kidney function testing
• Hydration assessment
• Monitoring for gastrointestinal adverse effects
• Medication dose review

Because recommendations vary between individual medications, treatment decisions should be based on the specific medication prescribed and the severity of kidney impairment.

5. Gallbladder Disease

GLP-1 and GLP-1/GIP medications have been associated with an increased risk of gallbladder-related complications, including gallstones and inflammation of the gallbladder. Rapid weight loss itself may also increase the likelihood of gallstone formation, which can make it difficult to distinguish medication-related effects from weight-loss-related risk factors.

Potential gallbladder complications may include:

• Gallstones (cholelithiasis)
• Gallbladder inflammation (cholecystitis)
• Biliary colic
• Bile duct obstruction

Symptoms that may require urgent medical evaluation include:

• Upper abdominal pain, especially after eating
• Pain radiating to the shoulder or back
• Fever
• Nausea or vomiting
• Yellowing of the skin or eyes (jaundice)

Users with a prior history of gallbladder disease should discuss these risks with their healthcare provider before starting treatment. In some cases, additional monitoring or alternative therapies may be considered depending on the individual’s medical history and symptom severity.

Surgery, Anesthesia, and Procedural Sedation

Because GLP-1 and GLP-1/GIP medications slow gastric emptying, food and fluid can remain in the stomach for longer than expected. In the context of anaesthesia or procedural sedation, this can theoretically increase the risk of regurgitation and pulmonary aspiration (stomach contents entering the lungs) even after standard fasting periods.

Recommendations in this area have evolved. Earlier 2023 guidance from the American Society of Anesthesiologists suggested holding daily-dose medications on the day of a procedure and weekly-dose medications one week before. Updated multi-society guidance issued in October 2024 — endorsed by the American Society of Anesthesiologists, the American Gastroenterological Association, the American Society for Metabolic and Bariatric Surgery, the International Society of Perioperative Care of Patients with Obesity, and the Society of American Gastrointestinal and Endoscopic Surgeons — concluded that most patients can continue their medication before elective surgery, with risk-stratified precautions rather than blanket discontinuation.

The updated approach focuses on:

• Shared decision-making between the user, the prescribing physician, the surgeon, and the anaesthesia team
• Day-of-procedure assessment for symptoms suggestive of delayed gastric emptying (such as nausea, bloating, or recent vomiting)
• A 24-hour clear liquid diet prior to the procedure for users considered at higher risk (e.g. those still in dose escalation, on higher doses, or with persistent gastrointestinal symptoms)
• Anaesthetic plan adjustments where appropriate to minimise aspiration risk
• Point-of-care gastric ultrasound in selected high-risk cases, where available, to assess gastric contents before sedation

Key user guidance:

• Always inform the anaesthesia and surgical team that you are taking a GLP-1 or GLP-1/GIP medication, including the specific drug, dose, and timing of your most recent dose
• Do not stop or hold your medication ahead of a procedure without confirmation from your prescribing physician and the procedural team — abrupt discontinuation may also have implications for glycaemic control
• Follow any procedure-specific fasting or pre-procedure diet instructions provided by your care team
• Mention this medication for any procedure involving sedation, including endoscopy, colonoscopy, dental work under sedation, and elective surgery

Current Medications and Interaction Risk

Before starting GLP-1 or GLP-1/GIP therapy, you should inform your clinician of all medications you are taking, including prescription drugs, over-the-counter treatments, and supplements. This is important because these medications slow gastric emptying and intestinal transit, which can affect how other drugs are absorbed and tolerated.

Special attention should be paid to the following categories:

• Medications with narrow therapeutic windows, where small changes in blood levels can have significant effects
  • Examples: warfarin, levothyroxine, lithium, digoxin
• Medications requiring consistent absorption or timing, where altered absorption may reduce efficacy or stability
  • Examples: levothyroxine, oral contraceptives, tacrolimus, certain antiepileptics
• Oral hormonal contraceptives — see the dedicated contraception section above, particularly for tirzepatide
• Diabetes medications that increase hypoglycaemia risk when combined
  • Examples: insulin, sulfonylureas such as glipizide or gliclazide
• Medications that affect gastrointestinal motility or are affected by it
  • Examples: metoclopramide, loperamide, erythromycin
• Users on complex polypharmacy or unstable regimens — for example, multiple cardiovascular, psychiatric, or endocrine medications with frequent dose adjustments
  • Examples: antidepressants (sertraline, amitriptyline), antiepileptics (valproate, carbamazepine), antihypertensives (amlodipine, beta-blockers such as bisoprolol)

Because therapy can slow digestion, it may alter the timing, absorption, and overall effectiveness of co-administered medications, particularly during dose initiation and escalation. Careful monitoring and individualised dose adjustments may therefore be required under medical supervision.

Key Guidance for Users

Users taking GLP-1 or GLP-1/GIP medications should:

• Be informed of all potential contraindications before starting treatment
• Recognise the urgent warning signs above and know when to seek emergency care
• Report new or worsening symptoms promptly to their physician
• Inform any clinician treating them — including anaesthesia and dental teams — that they are taking the medication
• Maintain regular follow-up with their prescribing healthcare provider
• Never stop or adjust medication without medical guidance, unless instructed to do so as part of an emergency response

Final Note

GLP-1 and GLP-1/GIP medications can offer significant benefits, but they must be used responsibly. Awareness of contraindications, early recognition of warning signs, and clear communication with all members of a user’s care team are essential to safe use.

Users should always consult their prescribing physician to determine whether therapy is appropriate for their specific medical history and to decide when adjustment or discontinuation is necessary.

Disclaimer

This article is intended for general educational purposes only and does not constitute medical advice. It is not a substitute for individualised diagnosis, treatment, or recommendations from a qualified healthcare professional. Clinical guidelines, prescribing information, and the evidence base for these medications continue to evolve; users should rely on their prescribing physician for current, personalised guidance. SiPhox does not assume responsibility for clinical decisions made on the basis of this article. If you believe you are experiencing a medical emergency, contact emergency services or go to the nearest emergency department.

References

1. https://www.ncbi.nlm.nih.gov/books/NBK551568/
2. https://jamanetwork.com/journals/jama/fullarticle/2842199#google_vignette
3. https://link.springer.com/article/10.1007/s12325-022-02394-w
4. https://www.degruyterbrill.com/document/doi/10.7556/jaoa.2011.20020/html
5. https://journals.sagepub.com/doi/abs/10.1177/0145721715607981