What is insulin?
Insulin is a hormone that is mainly responsible for regulating blood glucose levels.
Why is insulin included in the metabolic axis?
High insulin levels can be a leading indicator of pre-diabetes and metabolic syndrome. While insulin is a necessary data point for those with diabetes it is also very useful for users without these concerns. Insulin levels can serve as a great indicator of your body’s reaction to your current diet and lifestyle. 
How can I better understand my results?
- Age 19 and below: 2-40 uU/mL
- Age 20 and above: 2-25 uU/mL