L - Arginine, Double Strength, NOW, 1000mg, 120 tabs, SupplementNOW L Arginine 1000 mg is an amino acid supplement primarily used to increase nitric oxide production in the body. Nitric oxide helps relax and widen blood vessels (vasodilation), which improves overall circulation and blood flow. Primary Benefits Circulatory Support: By relaxing blood vessels, it helps maintain healthy blood pressure levels and supports general cardiovascular health. Exercise Performance: Athletes often use it to improve "the pump"