There is no optimal age for women to take Colla Corii Asini, if the body has indications women of any age can use it. Colla Corii Asini is a solid gum made from donkey skin. Colla Corii Asini is sweet in flavor and flat in nature. It belongs to lung, liver and kidney meridians. It has the effect of nourishing Yin, tonifying blood, stopping bleeding and moistening dryness. It is often used in treating blood deficiency, dizziness, palpitation (rapid heartbeat, often accompanied by panic), muscle impotence and weakness, yin deficiency and insomnia, lung deficiency and dry cough, coughing and hemoptysis due to labor, vomiting blood, blood in urine, blood in stools and leakage of menstruation (excessive menstruation or more than a few drops), and so on. There is no age limit for Colla Corii Asini, and it can be used at any age with the above indications. Adverse effects of Colla Corii Asini are not clear. People with weak spleen and stomach, indigestion, loose stools (thin and unformed feces) should be cautious in taking Colla Corii Asini, and should not be used with rhubarb. Do not consume spicy food during the period of consumption. If there is a need for medication, it should be used correctly under the supervision of a doctor. Do not blindly self-medicate, so as not to cause discomfort to the body.