Yes, insulin is a drug that is used to treat people with diabetes. Diabetes is a chronic disease in which the body either does not produce enough insulin or does not effectively use the insulin it does produce. Insulin is a hormone produced by the pancreas that helps regulate blood sugar levels in the body by allowing cells to take up and use glucose from the blood. In people with diabetes, insulin therapy can help to control blood sugar levels and prevent complications of the disease. Insulin is typically administered by injection or via an insulin pump.