Optimum NutritionSerious Mass
Serious Mass is the ultimate in weight gain formulas with 1,250 calories per serving and 50 grams of protein for muscle recovery support.


Optimum Nutrition Serious Mass

SERIOUS MASS is the ultimate muscle building and weight gain formula. With 1,250 calories per 2-scoop serving and 50 grams of protein to support muscle recovery, this 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 support your weight gains goals.

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