Creatine is the most widely researched supplement, time and time again it has been shown supplementing with creatine results in increased strength and muscle mass! Creatine is one of the most popular bodybuilding supplements available today. Creatine supplements are used by bodybuilders and athletes to increase overall performance in the area of strength and recovery. Creatine is naturally created in the human body primarily by the liver and kidneys. It is a critical amino acid for the body's muscles. This amino acid can be found naturally within the meat food group, red meat in particular. The greatest need for creatine is in muscles that require quick energy, primarily the skeletal muscles and brain.