L-Arginine is an amino acid that promotes heart health. It stimulates nitric oxide, a compound involved in circulatory and immune 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. Suggested Use. As a dietary supplement for adults, take one (1) to six (6) vegetable capsules daily, between meals, or as directed by a healthcare practitioner. Other.