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Optimum Nutrition Serious Mass is a vegetarian-friendly, high-calorie weight gainer powder delivering 1200+ calories, 50g protein, and 250g+ carbs per serving, enriched with 24 vitamins, minerals, creatine, and glutamine to support muscle growth and recovery for those struggling to gain mass.
| Additives | L-Glutamine |
| Brand | OPTIMUM NUTRITION |
| Format | Powder |
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