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You’ve heard a lot about the benefits of creatine. But what is it? Creatine is a naturally occurring amino acid-based compound that stores energy from already existing amino acids in your body, as well as from foods. Foods rich in creatinine include red meat and fish. When creatine is stored in the human body, it is known as phosphocreatine. Basically, phosphocreatine works as an energy storage system in your muscles, providing the energy you need for them to contract. Phosphocreatine also contributes to the regeneration of ATP molecules (adenosine triphosphate), which is we learned in high school biology is the process by which we get energy from food.