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🚀 Bulk up like a boss with Serious Mass — because average gains are so last season!
Optimum Nutrition Serious Mass is a high-calorie weight gainer delivering over 1,200 calories, 50g of blended whey protein, and 249g of carbs per 2-scoop serving. Enhanced with 20+ vitamins and minerals including Vitamin C and Zinc for immune support, plus creatine for muscle performance, it’s designed for adults aiming to bulk up efficiently. Ideal for post-workout or between meals, this chocolate-flavored powder blends best with a blender and offers versatile mix-in options to maximize your calorie intake and muscle growth.






















| Asin | B0015R36SK |
| Date First Available | May 7, 2005 |
| Department | unisex-adult |
| Is Discontinued By Manufacturer | Yes |
| Item Model Number | 1101537 |
| Manufacturer | Glanbia Performance Nutrition |
| Product Dimensions | 6.14 x 6.14 x 9.76 inches; 1.98 Pounds |
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