L-Arginine is an amino acid that promotes heart health by helping to support coronary blood flow and vascular function; 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, which can support active lifestyles and exercise. This product provides free-form L-arginine to promote optimal absorption and assimilation.