Vascular SupportSupport Nitric Oxide and Protein SynthesisGluten FreeDietary SupplementAmino AcidIgen™ Non-GMO TestedEasy Solv®L-Arginine is an amino acid that plays an important role in the synthesis of proteins, the production of creatine phosphate (needed to produce ATP), and the synthesis of nitric oxide, a secondary messenger involved in blood flow.