Low and prolonged menstrual flow is overwhelmingly caused by estrogen deficiency. Due to the lack of estrogen, the endometrial lining becomes thin, so that when you have your period, the endometrial lining is shed, causing a decrease in the amount of menstruation. In addition, the endometrium cannot be repaired after menstruation due to estrogen deficiency, so menstruation will take longer. In this case, it is better to start to take the oral supplement Jiale on the 5th day of menstruation, and take it for 21 consecutive days, and when you take the 16th tablet, add progesterone pills, take it once a day, take two pills once, and use it for 5 consecutive days, then stop the medicine together, and you will have your period 3-7 days after stopping the medicine, and it is recommended to use the medicine for 3 consecutive menstrual cycles.