sentence: Creatine is already in the body as a natural substance.
sentences_after: The body changes it to phosphocreatine. It is then stored as energy in the muscles. Creatine is mainly used in the lactate system and the phosphocreatine system because these two need more energy. They also take a part of the energy from the production or the absorption of creatine.
concept_name: creatine
headings: Creatine
categories: Biochemistry