Optimum Nutrition (ON) Serious Mass High Protein High Calorie Weight Gainer Powder

Now Suitable for Vegetarians, SERIOUS MASS is the ultimate weight gain and muscle building formula. With +1200 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 gains goals.