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๐ Bulk up like a boss with Serious Massโbecause average gains are so last season.
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended protein, and 250g of carbohydrates per 2-scoop serving. Enhanced with 20+ vitamins and minerals including immune-supporting Vitamin C and Zinc, itโs designed for serious muscle growth and weight gain. Perfect for post-workout or between meals, it offers versatile blending options to maximize your calorie intake and fuel your bulk-up journey.






















| ASIN | B00OV0VYHI |
| Age Range Description | Adult |
| Allergen Information | Milk, Soy |
| Best Sellers Rank | #1,367 in Health & Household ( See Top 100 in Health & Household ) #1 in Sports Nutrition Weight Gainers #161 in Sales & Deals |
| Brand | Optimum Nutrition |
| Brand Name | Optimum Nutrition |
| Customer Reviews | 4.5 out of 5 stars 4,915 Reviews |
| Diet Type | Vegetarian |
| Flavor | Chocolate Peanut Butter |
| Global Trade Identification Number | 00748927052572 |
| Item Dimensions | 11.5 x 5.5 x 16 inches |
| Item Weight | 12 Pounds |
| Manufacturer | Glanbia Performance Nutrition |
| Manufacturer Part Number | 1056371 |
| Material Type Free | Caffeine Free |
| Model Name | ON SERIOUS MASS CHOC PB 12LB |
| Model Number | 1056371 |
| Number of Items | 1 |
| Package Type Name | Tub |
| Product Benefits | Immune Support, Muscle Growth, Weight Gain |
| Protein | 50 Grams |
| Protein Source | Whey |
| Recommended Uses For Product | Calorie Increase, Muscle Growth, Post-Workout, Weight Gain |
| Servings per Container | 16 |
| Supplement Formulation | Multi-Supplement |
| Total Servings Per Container | 16 |
| UPC | 748927052572 |
| Unit Count | 192.0 Ounce |
| Vitamins And Minerals | 0.9, 3.7, 30, 5, 700 Milligrams |
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