Dietary Supplement. Increase muscle pumps. Increase vascularity. Increase muscle hardness. ArgiLean - Pump up your muscles! ArgiLean - is an esterified form of arginine (C15H22N4O3HCl) designed to penetrate the lipid membranes of muscle cells where its unique molecular structure increases nitric oxide production resulting in full, hard, pumped muscles. ArgiLean works at only a fraction of the dosage required with other forms of arginine. The effects of ArgiLean are noticeable within just a few days of use. This product is independent lab assayed for purity. (These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease).