Creatine is an important protein for muscle and is invaluable for athletes.creatine is an important protein for muscle and is invaluable for athletes. It is made up of 3 amino acids, including arginine, glycine and methionine, and helps supply energy to cells. It is available in the diet, but in insufficient quantities. Taking creatine as a dietary supplement as part of a bodybuilding program enables you to exercise more intensely and therefore achieve better results more quickly.