The reason for not getting menstrual period is that Colla Corii Asini has the function of blood tonic and hemostatic effect. It is not recommended to take it during menstruation. It is better to take it 2-3 days after menstruation. If you have delayed menstruation after taking Colla Corii Asini, it is best to take an early pregnancy test to rule out pregnancy and consider that it is caused by taking Colla Corii Asini. If you stop taking Colla Corii Asini, your menstruation may be caused by endocrine disorder, gynecological inflammation, excessive physical exertion, or staying up late at night, etc. You can go to the hospital for hormone 6 examination, gynecological ultrasound examination, and routine examination of white belt, and then get reasonable treatment.