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Optimum Nutrition

Putting on size has never been easier! Using OPTIMUM NUTRITION SERIOUS MASS is the ultimate in weight gain formulas. With 1,250 calories per serving and 50 grams of protein for muscle recovery support, this instantized powder makes the ideal post-workout and between meals shake for sizing up your goals. 

High Calorie Gainer to Support Serious Mass

  • Massive 1250 Calories per Serve
  • 50 Grams of Quality Protein, Derived from 4 Different Protein Sources
  • Complete Meal Replacement with 25 Vitamins & Minerals
  • Made in a GMP Compliant U.S Facility, Strictest Quality Control


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