It is mainly used to replenish estrogen in the body, which can increase the estrogen level in the body, and is often used to treat symptoms caused by thin endometrium or estrogen deficiency during menopause. Under normal circumstances, the endometrium will proliferate and shed with the menstrual cycle. If the estrogen level in the body is low, it will affect the normal proliferation of the endometrium and lead to thin endometrium, which may affect normal conception in serious cases. Generally, you need to take progestin drugs at the same time, that is, estrogen during the first half of the menstrual cycle, and progestin after ovulation, and menstruation after stopping the drug because the endometrium loses hormonal support.