Available in 4 amazing flavors Try Endurox R4 in Chocolate, Fruit Punch, Tangy Orange, or Lemon Lime. All great taste with even better results. | 4:1 Carb to Protein Ratio Revolutionary patented 4:1 carb-protein ratio speeds up muscle recovery after intense workouts. | Available in 2 sizes Endurox R4 is available in 2 different sizes. 14 serving and 28 serving. |