Optimum Nutrition Serious Mass Weight Gainer Protein.

New look, with the same trusted Quality.

High Calorie Weight Gainer: 1,250 Calories per 2-Scoop Serving.

50 Grams of Protein per Serving. Over 250 Grams of Carbohydrates per Serving.

Over 250 Grams of Carbohydrates per Serving.

Vitamin C, Zinc and Vitamin D Provide Immune Support along with Vitamin E.

Optimum Nutrition Serious 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, 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.