NOW Foods Sports, L-Arginine, 1,000 mg, 180 Tablets

NOW Foods - NOW Sports L-Arginine Amino Acids Double Strength 1000 mg. - 180 Tablets 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. This product has twice the L-Arginine (1,000 mg per tablet) as in their regular strength product (500 mg per capsule).