Optimum Nutrition Serious Mass

$49.99 (as of March 18, 2018, 12:51 PM)

High Calorie Weight Gainer: 1,250 Calories per 2-Scoop Serving
50 Grams of Protein per Serving
Over 250 Grams of Carbohydrates per Serving

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ON™ Serious Mass™

High Calorie Weight Gainer

Serious Mass is the ultimate in weight gain formulas. With 1,250 calories per serving and 50 grams of protein for muscle recovery, this instantized powder makes the ideal post-workout and between meals shake for sizing up your goals. Serious Mass provides you with the tools you need to pack on the pounds and help you develop the physique you’ve always wanted.

Beyond The Basics

  • Adding Calories Has Never Been This Easy or Tasted So Good
  • 1,250 Calories
  • 50g of Blended Protein
  • Over 250g of Carbohydrates with No Added Sugar
  • Creatine, Glutamic Acid
  • 25 Vitamins and Essential Minerals

†These statements have not been evaluated by the FDA.
This product is not intended to diagnose, treat, cure, or prevent any disease.

Additional information




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