For Exercise Lasting MORE Than One Hour. Recover Faster. Recover Better. Come Back Stronger. 4:1 Carbohydrate/Protein Formula. Naturally Flavored. We've raised the bar on muscle recovery drinks. PacificHealth Laboratories the company that pioneered the science of muscle recovery with the development of Endurox® R4® has just raised the bar again. No product can help your muscles rebuild and recover faster. With this improved formula we've now decreased the sugar by 25% and optimized the carbohydrate profile for even faster recovery. . The drink that advanced the science of muscle recovery. Endurox® R4® with its patented ratio of carbohydrate and protein (4:1) along with antioxidants electrolytes and glutamine is proven to help muscles:. Recover Faster -- Replenishes muscle glycogen levels 128% more than a carbohydrate drink. Carbohydrate/protein formula rebuilds muscle protein 38% more than a protein drink. Recover Better -- Reduces post-exercise muscle damage up to 36%. Come Back Stronger -- Extends endurance up to 55% in a subsequent workout.