Creatine monohydrate is naturally produced in the human body from amino acids primarily in the kidney and liver. It bonds with phosphorus in the body makin creatine phosphate which is a high energy compound used by muscles for instant energy needs. Muscles that perform high energy movements frequently will have and require much larger concentrations of creatine, free form aminos, and proteins. Holding more creatine means your body will physically be able to perform more work. Supplementing with creatine can boost muscle size, strength and endurance, improve athletic performance, and speed muscle recovery.