Free-Form Amino AcidDietary SupplementCirculatory HealthCardiovascular SupportImmune FunctionPotency & Quality GuaranteedAn FDA Regulated FacilityGluten-FreeNo Artificial PreservativesProviding the highest quality nutritional supplements since 1965.L-Arginine is a precursor of nitric oxide, which is necessary for the healthy dilation of blood vessels, circulation, and blood flow. L-Arginine supports circulatory, cardiovascular, and immune system health, and may promote athletic performance.