Creatine phosphate is the naturally occurring substance that provides short-term energy for the muscles during training and other energy-consuming activities. It is a phosphorylated creatine, which is a compound of three amino acids: arginine, glycine and methionine.
These are non-essential amino acids and the body's own supply travels through the blood stream to the cells where creatine is synthesized. Arginine and glycine form guanidinoacetate in the kidneys, whereas creatine phosphate synthesis is completed in the liver by the addition of S-adenosylmethionine. The University of Delaware states that the creatine phosphate helps the muscles and neuron cells replenish their fuel reserves.