SERIOUS MASS

Optimum Nutrition Serious Mass – High-Calorie Weight Gainer for Serious Size & Strength

Serious Mass by Optimum Nutrition is the ultimate mass-gaining solution for those who need extra calories, protein, and nutrients to support rapid muscle growth and weight gain. Each serving delivers a massive 1,250+ calories, 50g of high-quality protein, and over 250g of carbohydrates—ideal for hard gainers, bodybuilders, and athletes in a bulking phase.

Enhanced with creatine, glutamine, and 25+ vitamins & minerals, Serious Mass provides a comprehensive formula to help you fuel heavy training sessions, recover faster, and build real size.

Key Benefits:

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• 1,250+ calories per serving (when mixed with water)
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• 50g of blended protein for muscle repair and growth
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• 250g+ of complex carbs with no added sugar
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• Fortified with creatine, glutamine & essential nutrients
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• Supports muscle mass, weight gain & strength goals
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• Great-tasting flavors and smooth mixability
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Perfect For:

Hard gainers or anyone needing serious calorie and protein support to gain weight, build muscle, and boost recovery.