Carbohydrate Free Acid Casein is produced by controlled acid precipitation from skimmed milk. The Acid Casein contains 21% amino acids and is one of the main proteins found in milk. The Acid Casein is widely used in various food processing methods like making of sauces, gravies and other edible food. Carbohydrate Free Acid Casein is completely soluble in alkali and insoluble in water.