| Message: | Creatine is a naturally occurring amino acid (protein building block) found mainly in muscles. Fifty percent of creatine in our bodies is ingested through the foods we eat while the other 50% is made in the liver, kidney, and pancreas. Roughly one-third is in its free form as creatine, while the remainder is bound to phosphate and called creatine phosphate or phosphocreatine. During high-intensity, short-duration exercise, such as lifting weights or sprinting, phosphocreatine is broken down into creatine and phosphate. The energy released in this process is used to regenerate ATP, a major source of energy within the human body that drives a number of biological processes including muscle contraction and protein production.
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