Optimum Nutrition 100% Casein Protein is the Worlds No. 1 and the industrys first all-micellar Casein. Recommended for use in the evening, each great tasting Optimum Nutrition 100% Casein Protein shake contains 24g of the purest protein, 3g of carbohydrates, but just 0.5g of fat and no sugar. Its also instantised to mix up easily, every time.Casein is best taken at night, as this is when the majority of muscle rebuilding takes place. Simply add one rounded scoop to 10-12 oz (300-360ml) of water, milk or your favourite drink in an ON shaker half an hour before bed.Suitable for Vegetarians.