The ultimate in weight gain formulas each great tasting chocolate flavour shake contains 1 250 calories per serving 50g of blended protein and 250g carbs per serving with no added sugar includes 25 vitamins and minerals creatine glutamine and mct optimum nutrition serious mass is the ultimate weight gain formula each delicious chocolate flavoured shake delivers 1 250 calories with no added sugar and less than 5g of fat per serving this includes 250g of carbohydrates and 50g of blend