Insulin is a naturally occurring hormone that is released by the pancreas. The body’s cells need insulin to remove and use glucose from the blood. The cells use glucose to produce the energy they need to perform their functions. The researchers first gave a young diabetic an active pancreatic extract containing insulin in 1922, and in 1939 the Food & Drug Administration (FDA) approved insulin. At this point, the insulin for healing was obtained from the pancreas of beef and pork plus recombinant (human) technology. The FDA approved the first recombinant human insulin in 1982.