Supplements containing nitric oxide are among the most popular supplements. Nitric oxide is a free radical, a chemical essential in many physiological and pathophysiological processes. Dietary supplements with nitric oxide (nitrogen monoxide) allow a dramatic increase in muscle mass, which is a potent vasodilator agent. Nitrous oxide must be taken before training, thus enabling muscles to be fed with increased blood flow, and therefore, more oxygen and nutrients. On the basis of amino acid L-arginine supplements stand, intermediate precursor of nitric oxide synthesis in the body. Amount of arginine is converted to nitric oxide and the enzyme activity determined. If high doses of arginine, increases arginasei, liver specific enzyme that breaks down arginine and increases its absorption into the blood ...