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🚀 Bulk up like a pro with Serious Mass — because your gains deserve serious fuel!
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering 1,260 calories, 50g of blended protein, and over 250g of carbohydrates per 2-scoop serving. Enhanced with 25 vitamins and minerals plus creatine and glutamine, it’s designed to maximize muscle growth and weight gain when combined with resistance training. Ideal for adults seeking a powerful post-workout or between-meal shake to accelerate size and strength.














| ASIN | B000GIPJ02 |
| ASIN | B000GIPJ02 |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #2,027 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #266 in Sales & Deals |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 4.5 out of 5 stars (19,978) |
| Date First Available | May 27, 2004 |
| Department | GNC|ALL|ALL|NUTRITIONAL SUPPLEMENTS |
| Diet Type | Vegetarian |
| Flavor | Vanilla |
| Item Dimensions | 15.35 x 11.42 x 5.51 inches |
| Item Weight | 12 pounds |
| Item model number | 1031920 |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1031920 |
| Material Type Free | Caffeine Free |
| Model Name | Optimum Nutrition Serious Mass Weight Gainer Protein Powder Vitamin C Zinc and Vitamin D for Immune Support |
| Model Number | 1031920 |
| Net Content Volume | 13.88 liters |
| Number of Items | 1 |
| Package Type Name | Canister |
| Product Benefits | Muscle Growth, Weight Gain |
| Product Dimensions | 15.35 x 11.42 x 5.51 inches; 12 pounds |
| Protein | 50 g |
| Protein Source | Casein, Egg, Whey |
| Recommended Uses For Product | Post-Workout |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927023824 |
| Unit Count | 192 Ounce |
| Vitamins And Minerals | 0.9, 3.0, 30.0, 5.0, 700.0 milligrams |
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