It is a substance naturally produced by the body, kidneys, liver and pancreas, and derived from the amino acids arginine, methionine and glycine. Creatine is stored in skeletal muscles in the form of phosphocreatine, which is the immediate energy source for muscle contraction but is rapidly exhausted. Phosphocreatine is indispensable for the exercise of short duration and high intensity, anaerobic in nature, such as weightlifting. When it runs out quick energy source performance deteriorates due to the inability to obtain new power loads with the required speed.

Creatine is the only nutrient that the athlete can not cover with food. As found in small amounts in meat and fish, to provide the body with the daily maintenance dose would be necessary to consume many kilos of meat per day.

But not everyone benefits. Also detected some adverse effects from eating this supplement, such as increased body weight from fluid retention and not increased muscle mass. This occurs because creatine is osmotically active, ie, attracting the flow of water into the cells.

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