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Creatine is an organic acid naturally occurring in the body that supplies energy to muscle cells for short bursts of energy (such as lifting weights) via creatine phosphate replenishment of ATP. A number of scientific studies have proven that creatine can increase strength, energy, and muscle mass in addition to reducing recovery time. Also, recent studies have shown that creatine improves brain function, improves recognition memory, and reduces mental fatigue. It increases what is known as cell volumization by drawing water into muscle cells, making them larger. This intracellular retention should not be confused with the common myth that creatine causes bloating (or intercellular water retention). Creatine is sold in a variety of forms, including Creatine monohydrate, Creatine ethyl ester and Creatine malate, among others. Though all types of creatine are sold for the same purposes, there are subtle differences between them, such as price, and necessary dosage. Non-supplemental suppliers of creatine include various types of offal, red meat, and kidney meat.Claims that creatine could be stressful to the kidneys (due to primary renal elimination via creatinine) have not been proven in a scientific study, although no independent, large-scale survey has been conducted. However in most studies that have been carried out about creatine they have found an increased amount of muscle cramping due to the water retention changes.