Doctors Best, L-Arginine Sustained Plus Immediate Release, 1000 Mg, 120 Bilayer TabletsProduct Description L arginine is a conditionally essential amino acid that plays a vital role in cardiovascular health, circulation, and overall wellness. As a precursor to nitric oxide, it helps relax blood vessels, support healthy blood flow, and promote athletic performance. Product Benefits Supports Nitric Oxide Levels. Dietary Supplement. Helps Heart And Circulatory Health. Ingredients Supplement FactsServing Size: 1 Tablet Amount Per Serving %