Optimum Nutrition Serious Mass, Weight Gainer Protein Powder for Muscle Gain, Added Immune Support, Chocolate Peanut Butter, 12 Pound (Packaging May Vary)

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💥 Bulk up smarter, not harder with Serious Mass!

Optimum Nutrition Serious Mass is a high-calorie weight gainer powder delivering 1,250+ calories, 50g protein, and 250g+ carbs per serving, enriched with 22 vitamins and minerals for immune support. Perfect for adults aiming to maximize muscle gain and recovery with customizable shake options.