It is recommended not to take Colla Corii Asini when menstruation is almost clean. Colla Corii Asini has the effect of nourishing yin and tonifying blood, and it is recommended not to take it when menstruation is not yet over, so as not to cause an increase in the amount of menstruation and cause menstruation disorders. If women want to take Colla Corii Asini, they should wait until their menstruation is completely over before taking it, which is more effective and will not affect their menstrual cycle. During menstruation, women should avoid eating foods that replenish the blood, so as not to cause menstrual disorders, or even cause menstrual bleeding, women should pay attention to personal hygiene during menstruation, and change underwear and sanitary napkins regularly, so as not to cause genital infections.