Creatine is an organic acid that can be found in skeletal muscle. The greatest natural sources of creatine are animal skeletal muscle, in particular wild game, red meat and fish. Creatine is also manufactured in the human body through the interaction of the amino acids arginine, glycine and methionine in the kidney and liver. Creatine is also produced as a free form supplement. The most popular form of supplemental creatine is arguably creatine monohydrate. Creatine increases the synthesis of a compound called Adenosine Triphosphate (ATP). ATP is your body’s primary source of energy for the phosphate energy system; the energy system which your body uses to power short, sharp muscle contractions and other anaerobic exercise. Creatine allows your muscles to contract with more power for an increased number of repetitions, increasing your anaerobic exercise capacity. Combined with a sensible diet and workout regime, Creatine therefore allows you to train harder, for longer, and stimulate more muscle growth, resulting in an increase in muscle strength and size.