PROSCIENCE L-ARGININE supplements may enhance exercise performance by increasing nitric oxide in the body, which improves blood flow and oxygenation to muscles. A potent amino acid L-Arginine acts as a vasodilator – converting seamlessly into Nitric Oxide within the body. The result Amplified blood flow – leading to better muscle pumps, optimized workouts, and a boost in overall performance. It enhances athlete performance, many athletes use L-arginine for pre-workout energy. It can increase growth hormone response, and so can increase muscle mass. Supplementing with l-arginine allows your body to use accumulated fats as a source of energy. The accumulated fat is burnt to produce energy and to aid in muscle mass formation and development.