The Chinese medicine Colla Corii Asini has the effect of tonifying blood and nourishing yin, moistening dryness and stopping bleeding. Colla Corii Asini is a solid gum made from the dried or fresh skin of donkeys of the family Equidae by decocting and concentrating, which is sweet in taste and flat in nature, and belongs to the lung, liver and kidney meridians, and has the effects of tonifying blood and nourishing yin, moistening dryness and stopping bleeding. Colla Corii Asini is an important medicine for blood nourishment, its taste is sweet, nature is flat and moist, it can be used for all kinds of evidence of blood deficiency, such as atrophy due to blood deficiency, dizziness and palpitations, muscle impotence, heartburn and insomnia, false wind and internal movement. This product can nourish yin and moisten the lung, used for lung dryness, cough, cough and hemoptysis. Colla Corii Asini is also an essential medicine for stopping bleeding, and can be used in the treatment of vomiting blood and urinating blood, blood in stool and leakage of menstruation (excessive menstrual flow or dripping), and fetal leakage of pregnancy (small amount of vaginal bleeding in early pregnancy). Note that Colla Corii Asini is relatively precious, and usually has to be decocted and melted to be taken. The product is sticky and greasy, which hinders digestion, and should be used with caution for those with weak spleen and stomach, and should be taken under the guidance of a doctor, and it is not recommended to take the medication on one’s own.