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Cardiovascular HealthNitric Oxide BoosterSpecialtyDietary SupplementQuality Promise - Tested & TrustedGluten FreeDairy FreeSoy FreeNut FreeL-arginine is a free-form amino acid that your body converts into a chemical called nitric oxide. Nitric oxide is a vasodilator that promotes the relaxation of blood vessels circulation and heart health. While l-arginine is found naturally in red meats chicken fish and dairy sometimes our diet alone misses the mark. But don't worry we're here to help.