Since 1947 Free Form Supports Heart Health Nitric Oxide Stimulator Non-GMO Gluten, Wheat & Dairy Free Suitable for Vegans Certified Gluten-Free Kosher Parve Dietary SupplementL-Arginine is an amino acid that promotes heart health. It stimulates nitric oxide, a compound involved in circulatory function. Nitric oxide degrades very rapidly after its formation. L-Arginine serves as the precursor for continued nitric oxide production. This product provides Free Form L-Arginine to promote optimal absorption and assimilation.