Optimum Nutrition Serious Mass is a high-calorie weight gainer built to support serious muscle building and weight gain, delivering around 1,250 calories, 50g of protein, and over 250g of carbohydrates per two-scoop serving. The complete protein comes from fast-digesting whey, and the formula also adds creatine plus a range of vitamins and minerals, making it an ideal post-workout or between-meals shake.
- Around 1,250 calories per serving to support a calorie surplus
- 50g protein and 250g+ carbohydrates per serving
- Added creatine to support performance
- Includes vitamins and minerals; mix roughly 2 scoops with water or milk
- Added creatine to support performance
- 50g protein and 250g+ carbohydrates per serving