MTN OPS. Our proven enduro formula in single-serving stick packs for on-the-go use; works with body's cardiovascular system to amplify hydration and endurance during intense physical activity; 20+ hour release Get more out of your workouts: designed with l-arginine, a naturally-occurring amino acid, that helps increase blood flow and oxygen to muscles and cells throughout the body Recover faster: improves process of clearing waste products from muscles which results in a reduced sense of fatigue No crash: amino acid l-citrulline prolongs production of nitric oxide which prevents the "crash" so common in many energy supplements Increase your metabolism: black pepper extract increases absorption of nutrients which leads to increased energy