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๐ Fuel Your Ambition with Serious Mass โ Because Gains Wait for No One!
Optimum Nutrition Serious Mass is a high-calorie weight gainer protein powder delivering over 1,200 calories, 50g of whey protein, and 250g+ carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals for immune support, itโs designed for adults seeking rapid muscle growth and weight gain, perfect for post-workout or between meals. Versatile and easy to mix, it supports serious athletes and professionals committed to leveling up their physique.














| ASIN | B000GIPJ0M |
| ASIN | B000GIPJ0M |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,749 in Health & Household ( See Top 100 in Health & Household ) #2 in Sports Nutrition Weight Gainers #283 in Sales & Deals |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 4.5 out of 5 stars (34,822) |
| Date First Available | September 16, 2003 |
| Department | unisex-adult |
| Diet Type | Vegetarian |
| Flavor | Chocolate |
| Global Trade Identification Number | 00748927023800 |
| Item Dimensions | 11.5 x 5.5 x 16 inches |
| Item Highlight | Weight Gainer Protein Powder, Mass Gainer with Whey Protein, Creatine, Glutamine, BCAAs, Vitamins & Minerals, Easy Mixing |
| Item Weight | 12 pounds |
| Item model number | 1101529 |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1101529 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS CHOCOLATE 12LB |
| Model Number | 1101529 |
| 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 g |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927023800 748927063592 |
| Unit Count | 192 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 milligrams, 100, 100, 1560, 410, 44, 59, 80 percent_daily_value_fda |
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