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Optimum Nutrition Serious Mass is a high-calorie, high-protein weight gainer powder designed for adults with fast metabolisms or high energy demands. Each 3 kg tub delivers 1200+ calories, 50 grams of protein, and over 250 grams of carbs per serving, enriched with 23+ vitamins, minerals, creatine, and glutamine. Vegetarian-friendly and quality-assured with authenticity verification, it’s ideal for post-workout or between meals to accelerate muscle mass and weight gain.
| Additives | L-Glutamine |
| Allergen Information | Milk, Soy |
| Units | 3000.0 Grams |
| Serving Recommendation | 2 Scoops |
| Brand | Optimum Nutrition |
| Format | Powder |
| Age Range Description | Adult |
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