Product Information
Description
Optimum Nutrition Serious Mass is the world's most trusted mass gainer, delivering over 1,250 calories and 50g of protein per serve. Designed for hardgainers and athletes in a serious bulking phase, Serious Mass helps you pack on size and strength.
- 1,250+ calories per serve
- 50g protein per serve
- Complex carbohydrate blend for sustained energy
- World's #1 mass gainer brand
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