Serious Mass by Optimum Nutrition is one of the most trusted weight gain supplements worldwide. Each serving delivers over 1,250 high-quality calories, 50g of protein, and essential vitamins and minerals for healthy muscle growth. Ideal for hard gainers, skinny individuals, and bodybuilders who need to gain mass quickly. Mixes easily into shakes and is widely used for post-workout recovery.
✅ 1,250 calories per serving
✅ 50g protein + 25 vitamins/minerals
✅ Fast muscle gain support
✅ Great taste & value
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