Luteinizing hormone is very important for women and has the following effects: 1. It causes the endometrial glands to proliferate and will thicken the endometrium, reducing the excitability of the uterus during pregnancy and allowing pregnancy to proceed smoothly. 2. It works together with estrogen to develop the breasts and prepare them accordingly for breastfeeding after delivery. If a woman has insufficient luteal function, it can lead to a shortened menstrual cycle or irregular vaginal bleeding in the second half of the menstrual period, which may also lead to infertility and make it difficult for a fertilized egg to be laid. Therefore, if luteal insufficiency is detected, it is important to give treatment.