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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 over 1,200 calories, 50 grams of blended whey protein, and 250+ grams of carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, it’s designed for adults aiming to maximize muscle growth and weight gain. Versatile for blending with calorie-dense add-ins, this caffeine-free, vegetarian-friendly formula is a top choice for serious athletes and fitness enthusiasts.














| ASIN | B0015R36SK |
| ASIN | B0015R36SK |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,419 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #171 in Sales & Deals |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 4.5 out of 5 stars (34,680) |
| Date First Available | May 7, 2005 |
| Department | unisex-adult |
| Diet Type | Vegetarian |
| Flavor | Chocolate |
| Is Discontinued By Manufacturer | Yes |
| Item Dimensions | 6.14 x 6.14 x 9.76 inches |
| Item Weight | 0.9 Kilograms |
| Item model number | 1101537 |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1101537 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS CHOCOLATE 6LB |
| Model Number | 1101537 |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Product Dimensions | 6.14 x 6.14 x 9.76 inches; 1.98 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 | 8 |
| UPC | 748927022995 |
| Unit Count | 96.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams, 410, 80 Milligrams |
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