L-CitrullineCitrulline is a non essential amino acid, but its usefulness in athletes is quite remarkable. This amino acid is a precursor of arginine, but seems much better assimilated than the latter by the intestines. It significantly increases vasodilation by stimulating the production of nitric oxide. Citrulline supplementation has been shown to increase performance, reduce the feeling of fatigue during exercise and could stimulate protein synthesis. In