Optimum Nutrition
Optimum Nutrition Serious Mass Weight Gainer
1,250 calories per serving with 50g of protein to help build muscle size and strength.
Out of stock
Description
Serious Mass is a high-protein weight gainer formulated for hard gainers looking to bulk up. Each serving provides 1,250 calories, 50g of protein and added vitamins and minerals, plus creatine and glutamine.
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