If you’re an athlete who wants to get the best results from your workout, then MET-Rx Extreme NOS Pumped should be your number one choice for a pre-workout RTD! Extreme NOS Pumped contains Arginine, an amino acid involved in the formation of nitric oxide.* During workouts, nitric oxide production can help support circulation and nutrient delivery to active cells.* Our Extreme NOS Pumped Complex also contains Citrulline Malate to reduce and delay fatigue*. Extreme NOS Pumped contains Glycerin, which may help support body hydration, and 200 mg of Caffeine to promote energy flow.