Minor correction: Insulin has an activity time of about 5-10 minutes once it reaches your bloodstream. The challenge is getting it there; the measured activity

Minor correction: Insulin has an activity time of about 5-10 minutes once it reaches your bloodstream. The challenge is getting it there; the measured activity time of insulin comes from the time it takes to diffuse through subcutaneous tissue. (This is one of the reasons why healthy individuals, whose pancreata release insulin directly into the bloodstream, have tighter blood glucose control.)