Serious Mass from Optimum Nutrition is the ultimate high-calorie weight gainer for individuals aiming to pack on serious size and strength. This 12LB powder formula delivers a powerful combination of quality protein, complex carbohydrates, and essential nutrients to support muscle growth, recovery, and energy replenishment. Perfect for hard gainers and athletes, it provides a convenient and effective way to meet your daily calorie and nutrient needs. As one of the most trusted nutritional supplements, Serious Mass helps you achieve your weight and performance goals faster.
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