Colla Corii Asini is a solid gum made from the dried or fresh skin of donkeys of the family Equidae by decoction and concentration. Colla Corii Asini has the effect of tonifying blood and nourishing yin, moistening dryness and stopping bleeding. It is used in treating blood deficiency, dizziness and palpitations (rapid heartbeat, often accompanied by panic), muscle impotence, restlessness and insomnia, internal movement of deficiency wind, coughing with dryness of the lungs, coughing and haemoptysis with exertion, vomiting and urination of blood, blood in the stools and leakage of blood (excessive menstrual flow or more than one drop), and foetal leakage of pregnancy (small amount of bleeding from vagina in the early stage of pregnancy). It should be noted that the use of Colla Corii Asini is to be melted and taken. The adverse reactions of this product are not clear, but it is forbidden for those who are allergic to this product, and those with weak spleen and stomach, vomiting, diarrhea and poor digestion should not take Colla Corii Asini. This product should be taken under the guidance of a traditional Chinese medicine practitioner to recognize the evidence, and should not be blindly self-medication, so as not to cause delays in the condition.