L-Arginine is an amino acid that’s essential to the body’s production of nitric oxide. Nitric oxide increases blood flow, letting more oxygen into your muscles by helping blood vessels relax and widen. This sends more nutrients into the muscles to produce energy that fuels workouts and reduces fatigue. L-Arginine 1500 is scientifically formulated to support energy levels, muscle pumps, strength and endurance. Better blood flow equals bigger pumps and muscle growth to perform at your best.