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The ultimate in weight gain formulasEach delicious banana flavour shake contains 1,250 calories per serving50g of blended protein and 250g carbs per serving - with no added sugarIncludes 25 vitamins and minerals, creatine, glutamine and MCTOptimum Nutrition Serious Mass is the ULTIMATE weight gain formula. Each delicious banana flavoured shake delivers 1,250 calories, but with no added sugar and less than 5g of fat per serving. This includes 250g of carbohydrates, and 50g of blended protein to support muscle growth. Mix 2 scoops with water or milk in a shaker, and enjoy between meals, post-workout and/or before bed. Supercharge your Serious Mass shake by adding nuts, fresh or frozen fruits or other ingredients.