Creatine is needed in muscles for the body to be able to produce energy. Endurance athletes, body builders, and active individuals have been supplementing with creatine for increased energy, strength, and faster muscle growth. During intense exercise, muscle is fueled by a substance called ATP (adenosine triphosphate) because the body stores only a limited supply of this, it must be continuously replenished during intense exercise. By supplementing with creatine monohydrate (the substance that the body uses to produce ATP), energy is produced at a faster rate allowing the muscles to perform more efficiently. Ultimate Nutrition Creatine is scientifically tested pure creatine monohydrate with enhanced biovoluminization for a longer lasting "pump", increased muscle strength and intensity. This ideal powder formula mixes easily into juice and is a great choice for body builders, weight lifters, runners, wrestles, and more.