Endurox R4 is the only performance recovery drink featuring the patented 4:1 ratio of carbohydrate and protein. Endurox R4 is proven to replenish muscle glycogen 128% faster and increase next-workout performance by 55% compared to. conventional sports drink. Studies have also found that it reduces post-exercise muscle damage by 36% and rebuilds muscle protein 38% better than a protein drink alone. If you're serious about performance, get the 4:1 advantage with Endurox R4.