Try to stop using soy isoflavones during menstruation. Menstruation is a withdrawal bleeding caused by a sudden decrease in estrogen and progesterone in the body. Soy isoflavones contain high levels of estrogen, which has the effect of promoting endometrial hyperplasia. Eating soy isoflavones during menstruation can cause endometrial hyperplasia, which can lead to prolonged menstrual duration. For women with normal menstrual cycles, it is recommended that soy isoflavones not be taken during menstruation. For women with irregular menstruation and reduced or deficient estrogen, soy isoflavones can be taken under the guidance of a doctor. In women’s physiological cycle, estrogen starts to rise after the end of menstruation to predominate in order to promote endometrial proliferation. You can start taking soy isoflavones after menstruation according to women’s physiological cycle. Most menopausal women have lower estrogen and can take soy isoflavones as appropriate.