When used internally, the amino acid arginine converts into nitric oxide, which helps relax blood vessels and improve circulation, thereby increasing blood flow to your heart. By increasing blood flow to the heart, it may help improve symptoms of clogged arteries, chest pain, angina, and coronary artery disease. Since arginine helps arteries relax and improves blood flow, it is helpful for erectile dysfunction. These products have a strict internet policy -- please contact us for more information on prices and delivery.