OPTIMUM NUTRITION Serious Mass – Chocolate Peanut Butter

Support your muscle growth and weight gain goals with OPTIMUM NUTRITION Serious Mass. Packed with 1,250 calories and 50 grams of protein per serving, this high-calorie formula helps fuel recovery and promote muscle growth. With a delicious chocolate peanut butter flavor, it’s perfect for post-workout or as a meal replacement to boost your daily nutrition.*

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