1 000g. Recovering after intense aerobic activity requires both replenishing glycogen and rebuilding muscle. Rebuild Endurance contains an engineered blend of carbohydrates to help jump-start glycogen replenishment. A selected blend of milk protein, glutamine and L-Carnitine aid muscle recovery and help support the immune system. Quickly metabolised whey protein, and slower-release casein protein create a rapid and sustained muscle building state.