Whey is a product obtained in cheese making. So it comes from milk. The protein part is isolated from whey and its powder is formed. Therefore, it is of animal origin and contains lactose. For those with lactose allergy, it would be logical to use products with lactase enzyme added. The added lactase enzyme breaks down lactose, so it is digested more easily. Fat is separated from whey and used in different foods. The processing can be done simply by drying or by removing non-protein materials such as oil. Whey protein is a fast digesting protein.