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Conditionally Essential Amino AcidNitric Oxide PrecursorNon-GMOA Dietary SupplementVegetarian /VeganHow It Works: Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion as well as in DNA synthesis and protein production. It is an important precursor of nitric oxide (NO) and thus plays a role in the dilation of blood vessels.