Consumption of Colla Corii Asini may increase menstrual bleeding. Colla Corii Asini has the effect of tonifying blood and nourishing yin, etc. It should be used in accordance with medical advice. Colla Corii Asini is a sweet and neutral Chinese herb that belongs to the lung, liver and kidney meridians. It has the effect of tonifying blood and nourishing yin, stopping bleeding and moistening dryness. It is used in treating blood deficiency, palpitations (rapid heartbeat, often accompanied by panic), dizziness, restlessness and insomnia, coughing and haemoptysis, coughing with dryness of the lungs, impotence and weakness of the muscles, internal movement of the wind, blood in the urine, vomiting blood, blood in the stools, metrorrhagia (excessive menstruation or more than a few drops), and foetal leakage in pregnancy. Therefore, if people with blood deficiency have low menstruation, they may experience increased menstrual flow after taking Colla Corii Asini. As Colla Corii Asini is sticky and greasy in nature, people with weak spleen and stomach and indigestion should be cautious in taking Colla Corii Asini. The use of Colla Corii Asini in the treatment of diseases should be guided by a doctor under the guidance of diagnosis.