NOW Foods, L-Arginine, Double Strength, 1,000 mg, 120 TabletsFrom True Nature Blend Description Amino Acids Conditionally Essential Amino Acid Nitric Oxide Precursor Non GMO A Dietary Supplement Vegetarian Vegan Kosher Family Owned Since 1968 GMP Quality Assured 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