Insulin is a polypeptide hormone that is important for regulating the amount of glucose in the blood. It is produced in the pancreas by the beta cells of the islets of Langerhans.
Insulin given by injection acts similar to endogenous insulin. There are more than 20 different types of insulin available for diabetes treatment in the United States. The various types of insulin differ in several ways: such as source (animal, human or genetically engineered), the time for insulin to take effect and the length of time the insulin remains working.
Different types of insulin have been developed to satisfy the needs of individual patients.
Insulin is classified according to how it works in the body (onset, peak and duration) and whether it is rapid acting, short acting, intermediate acting, long acting or very long acting.
Insulin is used to treat Type 1 diabetes and it may be used together with oral medication in later stages of Type 2 diabetes.
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