One of the more popular nutritional supplements for athletes wanting to improve performance, endurance, and muscle mass, is creatine. Creatine is a nitrogenous organic acid that is produced naturally in the body, playing an integral role in supplying energy to all cells in the body, primarily to the muscles, by increasing the formation of adenosine triphosphate (ATP). It is produced in the liver, kidney, and pancreas. You can also get creatine by eating meat or fish or with dietary supplements. Most creatine is stored in skeletal muscle and used during physical activity. The remainder is used in the heart, brain, and other tissues. Continue reading →