Pure milk is not drinkable after the expiration date. Pure milk refers to raw milk in the dairy cow after milking in addition to sterilization, only a small amount of milk or no additives added. Pure milk can be stored at room temperature, but expired pure milk protein is easy to deteriorate, may also be accompanied by bacterial growth, after drinking may appear nausea, vomiting, abdominal pain, diarrhea and other gastrointestinal discomfort. In addition, after the expiration date of pure milk, the nutrients contained in it will be partially lost, so that the nutritional value of milk is reduced. Therefore, you should avoid drinking expired milk on a daily basis, check the production date and shelf life when purchasing milk, buy as needed, and drink in a timely manner.