What rebuilds the endometrium under the control of prolactin?

The endometrium is rebuilt primarily by the action of progesterone, which is secreted by the corpus luteum after ovulation. However, prolactin plays a supportive role in the maintenance of the endometrium during the luteal phase and in preparing the uterus for potential implantation. Prolactin promotes the growth of endometrial cells and supports the overall health of the uterine lining. Thus, while progesterone is the main hormone responsible for endometrial rebuilding, prolactin assists in this process.