Creatine plays a vital role in the release of energy in the muscles of humans and other animals.
Creatine also plays an important role in nerve cell function.
The body only maintains a supply of ATP sufficient to last a few seconds. Creatine also buffers lactic acid production, thereby reducing muscle fatigue. After CP is utilized by the muscles, the resultant creatine byproduct is transported by the blood to the kidneys, and excreted in urine as creatinine. Creatine is widely used by athletes, particularly in Europe, and is not banned by any U.S.A. or international sporting federation. There are indications that creatine supplementation also produces beneficial results in general populations.