Endurox R4 should be taken within two hours after exercise. During this time your muscle cells are far more efficient in replenishing muscle glycogen stores when there is sufficient amount of carbohydrate available and insulin is stimulated. Endurox R4 provides the necessary carbohydrate and protein in the correct proportion to stimulate insulin, the body's master recovery hormone. The amount of Endurox R4 you should consume depends on your body weight.