what does onset of insulin mean
Insulin is a medicine that lowers blood glucose (sugar). There are several types of insulin. Each type of insulin has a certain time period in which it works. In order to understand insulin action, it is helpful to know the onset, peak and duration of the insulin you take.1  Onset refers to when the insulin starts to work.2  Peak refers to when the insulin works hardest.ach type of insulin has a certain time period in which it works. In order to understand insulin action, it is helpful to know the onset, peak and duration of the insulin you take. 1  Onset refers to when the insulin starts to work. 2  Peak refers to when the insulin works hardest.