INCREASES CIRCULATIONL-Arginine increases synthesis of nitric oxide which is a vasodilator that improves blood flow and makes it easier for the body to transport nutrients and oxygen to the muscles and joint tissues. This makes it beneficial to the body both during and after exercise (especially during weight training, where muscles are more prone to damage). BOOSTS MUSCLE ENDURANCEL-Arginine is most preferred pre-workout supplement for enhanced energy, strength and muscle building. It increases endurance during athletic performance by increasing circulation and reducing exhaustion through the production of creatine. The increased circulation gets more oxygen to performing muscles to boost performance and enhance muscle development. PROMOTES MUSCLE PUMPSThe increased nutrient delivery caused by Arginine results in increased protein supply to the muscle tissue during exercise. Studies suggest that Arginine improves muscle gains from a heavyweight workout. It can promote the growth of muscle tissue, results in stronger muscle pumps which means your muscles look hard and toned.