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🚀 Bulk up like a boss 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 whey protein, and over 250g of carbs per serving. Enhanced with 25 vitamins and minerals plus creatine and glutamine, it supports muscle growth, immune health, and rapid weight gain. Perfect for adults seeking to maximize post-workout recovery and daily caloric intake, this vegetarian-friendly, caffeine-free formula is a top-ranked choice in sports nutrition.














| ASIN | B000GIPJ02 |
| ASIN | B000GIPJ02 |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,285 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #165 in Sales & Deals |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 4.5 out of 5 stars (19,903) |
| Date First Available | May 27, 2004 |
| Department | GNC|ALL|ALL|NUTRITIONAL SUPPLEMENTS |
| Diet Type | Vegetarian |
| Flavor | Vanilla |
| Is Discontinued By Manufacturer | Yes |
| Item Dimensions | 11.5 x 5.5 x 16 inches |
| Item Weight | 192 Ounces |
| 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 | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Product Dimensions | 11.5 x 5.5 x 16 inches; 12 Pounds |
| Protein | 50 Grams |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16.0 |
| UPC | 748927023824 |
| Unit Count | 192.0 Ounce |
| Vitamins And Minerals | 0.9, 3.0, 30.0, 5.0, 700.0 Milligrams, 100, 100, 28, 63, 80 Percent Daily Value |
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