Various types of insulin are available that differ in purity, concentration, and how quickly they work. They also are made differently. In the past, all commercially available insulin came from the pancreas glands of cows and pigs. The best sources of information on insulin are the company that makes it and a doctor. Points to Remember Insulin may be used when diet, exercise, or oral medications don't control diabetes.
Weight control is important when taking insulin.
Insulin is taken in special situations such as surgery and pregnancy. The National Institute of Diabetes and Digestive and Kidney Diseases of The National Institutes of Health. Noninsulin-Dependent Diabetes . NIH Publication No. Last updated February 10, 1997.