The Original ON Product
We only deal with the official and medically approved distributor of Optimum Nutrition products.
- SERIOUS MASS is the ultimate muscle-building and weight-gain formula.
- With 1,250 calories per 2-scoop serving and 50 grams of protein to support muscle recovery.
- This powder makes the ideal post-workout and between meals shake for sizing up your goals.
- SERIOUS MASS provides you with the tools you need to support your weight gain goals.
- High-Calorie Formula Supports Muscle Building³ and Weight Gain Goals¹1,250 Calories per Serving to Help Boost Calorie Intake¹50 Grams of Protein per Serving to Help Build and Maintain Muscle
- 252-254 Grams of Carbohydrates per Serving to Help Fuel Workouts¹
- 3 Grams of Creatine Monohydrate per Serving
- 25 Vitamins & Essential Minerals