Milk is a very good natural nutrient. It is rich in protein, fat, vitamins and minerals, and supplements essential amino acids. Moreover, the minerals in milk are easily absorbed by the human body, so milk is called ordinary drink. Milk and its products are one of the important sources of protein, calcium, phosphorus, vitamin A, vitamin D and vitamin B2 in the diet. With high nutritional value and easy digestion and absorption, it is most suitable for patients, children and the elderly.