Optimum nutrition serious mass chocolate 2400gonrsquos serious mass is the ultimate weight gain formula if you find it difficult to gain weight serious mass will help you develop the physique youve always wanted what does it do 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 when is the best time to enjoy my shake simply mix up 2 scoops with milk or w