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Optimum Nutrition Serious Mass Banana Weight Gainer Supplement creatinemonohydrate and the release of storedDescription High Protein Muscle Building & Weight Gain Formula*50 g Protein* Helps Build and Maintain Muscle*1,250 Calories Helps Boost Calorie Intake253 g Carbs Helps Fuel Intense WorkoutsArtificially FlavoredStrength TrainingSupports PerformanceSupports Weight Gain Goals*Authentic Optimum Nutrition Product Informed Choice We Test You Trust Why Serious Mass? 50 grams of protein to support muscle building and recovery.**1,260 calories to supports