100% Authentic
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The Ultimate High-Calorie Weight Gainer for Serious Results
Stop struggling to hit your caloric surplus and start seeing the progress you've worked for. Optimum Nutrition Serious Mass is the ultimate weight gain formula designed specifically for "hardgainers" and athletes with highly active metabolisms. If you find it difficult to consume enough quality calories through whole foods alone, this nutrient-dense shake provides the heavy-duty support you need to pack on size and develop a stronger physique.
Massive Calories and Multi-Phase Nutrition
To gain weight, you must consume more calories than you burn. Every serving of Serious Mass delivers a powerhouse of 1,250 calories and 50g of a premium protein blend to fuel muscle growth and repair. With over 250g of energy-sustaining carbohydrates and no added sugar, this formula provides the fuel necessary to power through intense workouts and fully replenish glycogen stores after a grueling session.
Comprehensive Muscle Support & Immune Health
Serious Mass goes beyond just calories; it prioritizes your overall wellness. This formula is fortified with 25 essential vitamins and minerals, including Vitamin C, Vitamin D, and Zinc, to provide vital immune support—crucial for athletes pushing their bodies to the limit. To further enhance your performance, each serving includes Creatine Monohydrate and Glutamine, helping to improve explosive power, strength, and post-workout recovery.
100% Authentic
Fast Shipping
14-Day Returns
The Ultimate High-Calorie Weight Gainer for Serious Results
Stop struggling to hit your caloric surplus and start seeing the progress you've worked for. Optimum Nutrition Serious Mass is the ultimate weight gain formula designed specifically for "hardgainers" and athletes with highly active metabolisms. If you find it difficult to consume enough quality calories through whole foods alone, this nutrient-dense shake provides the heavy-duty support you need to pack on size and develop a stronger physique.
Massive Calories and Multi-Phase Nutrition
To gain weight, you must consume more calories than you burn. Every serving of Serious Mass delivers a powerhouse of 1,250 calories and 50g of a premium protein blend to fuel muscle growth and repair. With over 250g of energy-sustaining carbohydrates and no added sugar, this formula provides the fuel necessary to power through intense workouts and fully replenish glycogen stores after a grueling session.
Comprehensive Muscle Support & Immune Health
Serious Mass goes beyond just calories; it prioritizes your overall wellness. This formula is fortified with 25 essential vitamins and minerals, including Vitamin C, Vitamin D, and Zinc, to provide vital immune support—crucial for athletes pushing their bodies to the limit. To further enhance your performance, each serving includes Creatine Monohydrate and Glutamine, helping to improve explosive power, strength, and post-workout recovery.