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Creatine is a natural compound made in the body and is derived from the diet through meat products. In the body, Creatine is changed into a molecule called phosphocreatine which serves as a storage reservoir for regenerating ATP. ATP is the chemical source of energy for muscle contraction and quick energy.
Muscle tissue does not produce creatine, and therefore it must take up creatine from the bloodstream. Once inside muscle cells, creatine gets a high-energy phosphate attached to it and is then known as phosphocreatine (PCr) or creatine phosphate.uscle tissue does not produce creatine, and therefore it must take up creatine from the bloodstream. Once inside muscle cells, creatine gets a high-energy phosphate attached to it and is then known as phosphocreatine (PCr) or creatine phosphate.