The difference in how they work is that Viagra blocks an enzyme called PDE5, which destroys nitric oxide, and L-arginine is used to make nitric oxide. Unlike Viagra, L-arginine is taken on a daily basis for erectile dysfunction

As Nitric oxide is a chemical which is needed to obtain an erection scientist believe that taking a supplement of L-Arginine could help with erectile dysfunction. Some studies have shown that men with erectile problems have sometimes had a deficiency of this chemical which could suggest that if taken as a supplement it could help men with erectile problems.

Several small studies show that increasing intake of foods high in L-arginine may help ease symptoms, increase exercise tolerance, and improve blood vessel function in people with angina and it is widly beleived that L-arginine may improve cardiac performance in people with congestive heart failure, according to a 2000 study published in Clinical Cardiology.

Studies also show that L-arginine may be effective for managing inflammation of the bladder, relieving leg cramping and weakness caused by blocked arteries (a condition known as intermittent claudication), and improving kidney function in kidney transplant patients taking cyclosporine. What's more, taking L-arginine in combination with ribonucleic acid and eicosapentaenoic acid (an omega 3 fatty acid) may reduce recovery time, protect against infection, and promote wound healing after surgery.

Some studies have also found the L Arginine may possibly be able to help men with low sperm counts, as the trial showed an increase in sperm when they had taken L Arginine. This product may be useful in helping to treat erectile dysfunction in some men, as well as possibly some other sexual difficulties encountered.

This chemical L-Arginine can not be made by the body so must be obtained through our diet. Nitric oxide is a chemical which is needed to obtain an erection. As L-Arginine makes this chemical scientists believe that taking a supplement of L-Arginine could help with erectile dysfunction.