Optimum Nutrition Serious Mass Gainer

Serious Mass is the ultimate weight gain high calorie protein and carb formula. With over 1,250 calories per serving and 50 grams of protein for muscle recovery, this instantised powder supplement makes a sizable post-workout and between meals supplement shake

Serious Mass gives you the tools you need to pack on pounds and - when coupled with serious weight training - develop your physique to the fullest.