Specially designed for hard gainers who want to gain weight and pack-on quality mass.* MET-Rx? Xtreme Size Up features FOUR Hardcore Optimizer Blends to help you keep growing when other weight gainers quit.* METAMYOSYN? Muscle Mass Optimizer Blend Complex Carb Optimizer Blend Lean Lipid Optimizer Blend MultiVitamin Optimizer Blend * Each serving contains 59g protein, 64-67g High-Quality Complex Carbs, 3g Creatine, 3g Glutamine and 600 calories * No Fructose or Aspartame * Mixes quickly and goes down easy