Protein powder, rich in protein powder, is used to supplement protein for people lacking in protein. There are many kinds of protein powder, such as whey protein, casein, bean protein, meat protein, etc., and their absorption and utilization efficiency are also different. As far as fitness instructors are concerned, whey protein powder is usually purchased. Whey protein is a spherical protein extracted from milk, which is a high-quality protein, and it is more easily digested and absorbed by human body than other protein.