Optimum Nutrition (ON) was founded in 1986 with a mission to set higher standards for the sports nutrition industry. As one of the few manufacturers to own and operate state-of-the-art production facilities that are GMP compliant, ON’s commitment to quality is uncompromising. You’ll appreciate the extra effort the industry leader puts into assuring ingredient purity, effortless mixing and exceptional taste.
High-Calorie Weight Gain Formula
Serious weight gain goals require serious calories. Unfortunately, those who need the extra calories most often have a hard time consuming enough of them. For many aspiring to be bigger, a highly- active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to get enough calories from food. With 1,250 calories and 50 grams of protein per serving, you’ve got lots to gain from ON’s Serious Mass. Get serious about your sizable ambitions with Serious Mass.
1,250 calories per serving mixed with water and 1,640 calories when blended into low-fat milk
Over 250 grams of carbohydrates to fuel intense workouts & help replenish glycogen stores
Includes 25 Vitamins & Minerals, Creatine, Glutamine & MCTs.
Calories That Count
With less than 5 grams of fat per serving, Serious Mass is the weight gain formula packed with calories that count during recovery.
Supercharge Your Serious Mass
Using an electric blender, you can add nuts, fresh or frozen fruits and other calorie-contributing ingredient to enhance the weight gain and muscle recovery potential of Serious Mass.
Optimal Usage Occasions
Between meals, after weight training and before bed.