IVF down regulation means that prior to IVF, the pituitary gland is lowered by taking medication to inhibit the occurrence of spontaneous ovulation, thus promoting more follicles to develop and mature at the same time so that multiple mature follicles can be extracted at once during egg retrieval in preparation for growing multiple fertilized eggs. The lowering of regulation can be achieved by using Treprostinil acetate, a gonadotropin-releasing hormone that inhibits the normal secretion function of the ovaries, thus inhibiting follicle development. The use of follicle stimulating medication in the next menstrual cycle can achieve the goal of having multiple follicles develop and mature at the same time in a month, thus preparing the eggs for IVF retrieval. IVF is a form of assisted reproduction, and descending is an important step in the IVF process. Only when descending is successful can more mature follicles be extracted to grow multiple embryos so that better quality embryos can be selected for transfer.