|Formulated by leading exercise physiologists, Glutamine and Arginine enhanced Endurox R4 delivers the hydration effectiveness of the leading sports drink, and: extends endurance by 55%; decreases post-exercise muscle damage by 36%; reduces free radical build-up by 69%; and increases insulin levels by 70% to speed the replenishment of muscle glycogen and the rebuilding of protein. Fruit Punch (PUN), Orange (ORF), Lemon Lime (LLF), Chocolate (CHO). 270 calories, 53g carbohydrates, 14g protein, 1g fat. 4.56 lb. can.