The sports nutrition industry's best-selling protein company presents the Optimum Nutrition (ON) Serious Mass that represents the gold standard of protein quality.
- 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.