Nitric Oxide Is Critical For Supporting Blood Flow And Nutrient Delivery To Active Cells. Met-Rx Nitropump Nos Can Be Used During Exercise When Blood Flow Dramatically Increases, And Post-Exercise When Your Body Demands A Rapid Supply Of Amino Acids And Carbohydrates For Recovery. Try Stacking Met-Rx Nitropump Nos With Met-Rx Ultramyosyn Whey Immediately After Your Workout For Improved Amino Delivery. Hard Gainers May Need The Advanced Support Of Met-Rx Size Up Mass Gainer For Rapid Carbohydrate And Amino Uptake And Delivery.