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About 80% of the body's citrulline is transformed in the kidneys into arginine, another amino acid . The subsequent conversion of arginine to nitric oxide, a potent dilator of blood vessels, might be the mechanism by which citrulline could serve as an ergogenic help. In fact, consumption of citrulline might be a extra efficient approach to raise blood arginine ranges than consumption of arginine as a end result of extra citrulline is absorbed from the gut than arginine. The International Olympic Committee considers caffeine to be a "managed or restricted substance;" Olympic athletes may eat it until urinary concentrations exceed 12 mcg/ml . The National Collegiate Athletic Association prohibits use of caffeine from any supply in quantities that would lead to urine concentrations exceeding 15 mcg/ml . (Consuming about 500 mg caffeine produces a urinary caffeine concentration of 15 mcg/ml within 2–3 hours .) The World Anti-Doping Agency doesn't prohibit or limit caff...