L-Arginine

 L-arginine is a conditionally essential amino acid found in the diet. This substance is a precursor of nitric oxide – an important compound that helps blood circulation.  L-arginine plays an important role in the treatment of cardiovascular disease due to its antiatherogenic, anti-ischemic, antiplatelet, and antithrombotic properties. It has been promoted as a growth stimulant and as a treatment for erectile dysfunction in men.