Optimum Nutrition Serious Mass is the ideal weight gain formula. If you find it difficult to gain weight, Serious Mass could help. Each delicious shake delivers an incredible 1,250 calories, with no added sugar. This includes 50 grams of blended protein to support building muscle and 250 grams of carbohydrates to fuel your workouts. To make your shake, simply mix up 2 scoops of Serious Mass powder with milk or water in your ON shaker and enjoy between meals, post-workout and/or before bed.
Calories per 334g serving: 1250
Protein (g) per 334g serving: 50