IT’S ALL ABOUT N.O. L-Arginine is a potent amino acid that occurs naturally in the body. It works to produce nitric oxide (N.O.), the "Miracle molecule" that helps relax blood vessels (known as vasodilation) and improve circulation, which leads to stronger blood flow. A fully substantiated 3, 000mg of L-Arginine in each serving, along with Bioperine and selenium for optimal absorption, means there is no doubt that you are getting the dose scientifically shown to produce powerful results time after time. Every Fundamentals formula was purposefully designed to pair with the full line of premium Force Factor supplements, helping you tackle your goals and fully unleash your Potential.