Creatine: amino acid present in muscle fibers and brain
What is Creatine
It is a natural substance (composed of amino acids) present in the circulatory system of vertebrate animals, mainly in muscle fibers and brain. It is a molecule that carries supplemental energy in some systems of the body. In invertebrate animals arginine acts similarly.
Adenosine triphosphate (ATP) is the body's main source of energy, but because brain, heart and muscle cells need large amounts of energy, they use creatine as an energy supplement.
Creatine is made by the kidneys and absorbed by cells in the liver. Once absorbed by cells, creatine will temporarily store energy for use by the body at a time of need.
Creatine is found in the flesh of animals as well as fish. Vegetables do not have creatine.
The chemical formula of creatine is NH2-C (NH) -NCH2 (COOH) -CH3