Optimum Nutrition (ON) Serious Mass Weight Gain Powder Chocolate is the ultimate weight gain solution for those who need extra calories but are going through a hard time consuming enough of them. With 1263 calories and 50 grams in every serving of protein for muscle recovery, this Serious Mass from Optimum Nutrition is the ultimate weight gain formula. Its highly nutritious contents make this weight gain formula from ON the ideal post-workout and between meals shake to help one attain their goals. ON Serious Mass helps enhance the physique that you have always wanted.
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