The shelf life of gum is usually 5 years. Therefore, boiled Colla Corii Asini can be kept in the refrigerator for 5 years. Colla Corii Asini is a valuable tonic that nourishes the blood and nourishes the yin, and is widely used by people, but is more expensive. Boiled Colla Corii Asini is afraid of moisture, it is easy to damp and moldy, and although the efficacy of Colla Corii Asini will not be reduced too much, the taste will deteriorate. Therefore, it is recommended to store it in a cool and dry place, such as in the refrigerator. Putting gum in a food bag and sealing it in the refrigerator can prevent gum from dampness and loss of potency to a certain extent. Alternatively, gum can be frozen in the refrigerator, e.g. take out a small amount and keep it in the freezer and put the rest in the freezer. In addition, it is recommended to smell and see if there is any discoloration before consuming the gum. If you find any odor, acidity or mildew, it may have deteriorated and it is recommended not to consume it.