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ON Serious Mass 12LB Vanilla | High-Calorie Mass Gainer Flavor:Chocolate and promote muscle growthON Serious Mass 12LB Vanilla High Calorie Gainer Optimum Nutrition Serious Mass, Vanilla, 12LB is the ultimate high calorie formula designed for individuals who struggle to gain weight or build muscle size. With each serving packed with 1,250 calories, 50 grams of protein, and a precise blend of carbohydrates, vitamins, and minerals, it provides everything your body needs to achieve serious muscle growth. This premium gainer from Optimum Nutrition