










🚀 Bulk up smarter, not harder with Serious Mass!
Optimum Nutrition Serious Mass is a high-calorie, high-protein weight gainer powder designed for adults with fast metabolisms who struggle to gain weight. Each 2-scoop serving delivers over 1200 calories, 50 grams of protein, and 24 vitamins and minerals, including creatine and glutamine, to support muscle growth and recovery. Suitable for vegetarians and sealed for purity, it’s ideal for post-workout or between meals to help you achieve serious mass gains.
| Additives | L-Glutamine | 
| Allergen Information | Milk, Soy | 
| Units | 1000.0 Grams | 
| Serving Recommendation | 2 Scoops | 
| Brand | Optimum Nutrition | 
| Format | Powder | 
| Age Range Description | Adult | 
Trustpilot
1 month ago
1 week ago