Drinking Colla Corii Asini will not affect menstruation under normal circumstances, but if you drink Colla Corii Asini during menstruation it may affect your menstrual flow. Colla Corii Asini generally refers to the skin of the donkey animal boiled down into a gum, mostly in solid form. It is flat in nature, sweet in taste, and mainly goes to the liver, lung and kidney meridians. It has the effects of tonifying blood, stopping bleeding, nourishing yin and moistening dryness (nourishing yin essence and clearing away heat and evil spirits), and is mainly used for treating dizziness caused by blood deficiency, yellowish color, weakness of limbs, heartburn and insomnia, vomiting blood, blood in stool, and disintegration of blood (excessively heavy menstrual flow or more than one drip), and so on. Drinking Colla Corii Asini generally means that Colla Corii Asini is melted and taken with warm water. Under normal circumstances, it can nourish blood and stop bleeding, nourish yin and moisten dryness, treat all the above symptoms seen in blood deficiency, and will not affect menstruation. However, if it is taken during menstruation, it may cause increased menstrual flow and dribbling of menstrual blood. Therefore, it is not recommended to take Colla Corii Asini during menstruation. It should be noted that people with weak spleen and stomach, dyspepsia should be cautious of using it, avoid drinking alcohol, and if taking other medicines at the same time, it is recommended to consult a doctor. In addition, if you have a need for medication, please take it under the guidance of a professional doctor at a professional medical institution.