Creatine is a natural substance produced by the liver, kidneys, and pancreas.
Creatine can also be obtained by eating meat and fish. Creatine enables the muscles to sustain maximal contractions for 3-10 seconds. When creatine supplies in the muscles are depleted, the body relies on carbohydrates for energy during anaerobic exercise. Creatine supplementation is promoted as a method of increasing the amount of creatine available to the muscles, thus decreasing the utilization of carbohydrate. This decreases lactic acid build-up, resulting in less muscle fatigue and less delayed onset muscle soreness.