Nitric oxide is a chemical compound found in the human body which is responsible for increases in blood flow. Nitric oxide release causes the endothelium to relax causing vasodilatation which increases blood flow through the arteries. Nitric oxide release impairment is often associated with diabetes, hypertension and atherosclerosis. Viagra and natural Viagra products work by stimulating the nitric oxide pathways in the body to improve blood flow to the penis. Although there are no direct nitric oxide supplements, L-Arginine 500 is commonly used as this is a precursor for nitric oxide production. Nitric oxide foods should be those high in iron and magnesium. The importance of nitric oxide production is why multisupplements like Vimulti include L-Arginine as a key ingredient.