Insulin represents a hormone that control level of glucose and is regulating fat metabolism in the body. In natural form this hormone is secreted from the pancreas.
It is widely used in medicine for treating different forms of diabetes mellitus. This disease appears at time when control of insulin in human body fails. Insulin is administered by injection under the skin (subcutaneously).
Insulin is considered to be the most anabolic hormone produced by the body. Bodybuilders and athletes consider this drug good choose in case the goal is to gain mass. For some years insulin became very popular in bodybuilding because of its anabolic effects.