100% Authentic
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14-Day Returns
Unlock Your Growth Potential with the Ultimate High-Calorie Mass Gainer
If you have a fast metabolism or find it nearly impossible to consume enough quality calories through whole foods alone, Optimum Nutrition Serious Mass is the professional-grade solution you need. Specifically engineered for "hardgainers" and athletes in a serious bulking phase, this nutrient-dense formula provides the heavy-duty caloric support required to increase size, strength, and overall body mass.
The Power of 1,250 Calories and 50g of Protein
Packing on serious mass requires a consistent caloric surplus. Every serving of Serious Mass delivers a powerhouse of 1,250 calories and 50g of a premium protein blend (including whey, casein, and egg protein) to fuel muscle protein synthesis and repair. With over 250g of energy-sustaining carbohydrates and no added sugar, this formula provides the fuel necessary to power through grueling workouts and fully replenish glycogen stores afterward.
Comprehensive Support for Immunity and Performance
Serious Mass goes beyond basic weight gainers by prioritizing your overall wellness. It is fortified with 25 essential vitamins and minerals, featuring Vitamin C, Vitamin D, and Zinc to provide vital immune support—essential for athletes pushing their bodies to the absolute limit. To further maximize your results, each serving is enhanced with Creatine Monohydrate and Glutamine to support explosive strength, power, and faster post-workout recovery.
100% Authentic
Fast Shipping
14-Day Returns
Unlock Your Growth Potential with the Ultimate High-Calorie Mass Gainer
If you have a fast metabolism or find it nearly impossible to consume enough quality calories through whole foods alone, Optimum Nutrition Serious Mass is the professional-grade solution you need. Specifically engineered for "hardgainers" and athletes in a serious bulking phase, this nutrient-dense formula provides the heavy-duty caloric support required to increase size, strength, and overall body mass.
The Power of 1,250 Calories and 50g of Protein
Packing on serious mass requires a consistent caloric surplus. Every serving of Serious Mass delivers a powerhouse of 1,250 calories and 50g of a premium protein blend (including whey, casein, and egg protein) to fuel muscle protein synthesis and repair. With over 250g of energy-sustaining carbohydrates and no added sugar, this formula provides the fuel necessary to power through grueling workouts and fully replenish glycogen stores afterward.
Comprehensive Support for Immunity and Performance
Serious Mass goes beyond basic weight gainers by prioritizing your overall wellness. It is fortified with 25 essential vitamins and minerals, featuring Vitamin C, Vitamin D, and Zinc to provide vital immune support—essential for athletes pushing their bodies to the absolute limit. To further maximize your results, each serving is enhanced with Creatine Monohydrate and Glutamine to support explosive strength, power, and faster post-workout recovery.