Optimum Nutrition Serious Mass is the ultimate weight gain formula. If you find it difficult to gain weight, Serious Mass can help you develop the physique you've always wanted! Without adequate calories and quality protein, you simply can’t get any bigger, without enough fuel and muscle-building nutrients like protein, you simply won’t grow!
Each delicious shake delivers an incredible 1,250 calories, but no added sugar. This includes 50g of blended protein to support building muscle and 250g of carbs to fuel your workouts. That’s serious calories, serious protein and serious carbs...that’s Serious Mass!
Add two heaped scoops (334g) of Serious Mass to a blender filled with 710 ml (24 ounces) of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie contributing ingredients and blend for an additional 30-45 seconds.