Life extension enthusiasts, body builders and health proponents have been telling the world of this amino acid combination for quite a few years now, and the science is catching up to their claims. Arginine is integral to the production of nitric oxide. It's an important substance involved with everything from cardiovascular function to muscular energy. Ornithine metabolizes to arginine in the body, and it has its own unique, nourishing influence on the body. Swanson L-Arginine & L-Ornithine brings you the proper two-to-one combination in free form for optimum results.