Lead a healthier and happier life with L-Arginine Powder by Now Foods. L-Arginine is a considered an essential basic amino acid involved primarily in urea metabolism and excretion. It is also required for 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 helps in building muscle, muscle tone and increasing muscle strength. It may also help with blood circulation. BenefitsPharmaceutical Grade Halal Non-gmo Gmp Certified Kosher