From the Manufacturer:
With Super Strength L-Arginine, you get a high- potency amino acid boost for circulatory health and more. L-arginine is a key player in the body's production of nitric oxide, a compound that helps keep blood vessels dilated to promote healthy blood flow. This makes Super Strength L-Arginine beneficial for overall cardiovascular maintenance and in areas such as sexual function that depends largely on healthy circulatory status.