Skip to How is creatine made? What does creatine do? Creatine Supplements Possible side effects Creatine (methylguanidine acetic acid) is a naturally occurring molecule derived from amino acids that is primarily stored in skeletal muscle. Creatinine is also found in the liver, pancreas, testes and kidneys, although in much smaller quantities. Once combined with phosphate to form phosphocreatine or creatine […]

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