After ovulation, women’s ovaries secrete progesterone, and the physiological effects of progesterone are divided into six main areas, as described below. Firstly, it can relax the smooth muscles of the uterus and reduce the excitability of the uterus, and it can also reduce the sensitivity of the uterine muscles to the contractile hormone, thus reducing the contraction of the uterus, which is conducive to the fertilization of the egg and its growth and development, so progesterone supplementation can have the effect of preserving the fetus and stopping bleeding. Secondly, progesterone can promote the endometrium of the proliferative phase to become the secretory phase, which is conducive to the implantation and development of pregnant eggs. Thirdly, progesterone can cause the cervical opening to close, and the mucus secreted by the cervical glands to decrease, become sticky, and reduce the degree of lacrimation, thus forming a mucus plug to block the cervical opening to prevent the entry of sperm and microorganisms. Fourthly, it also inhibits the contraction of the fallopian tubes, thus making the lumen of the tubes even overnight? Mucus secretion decreases. Fifthly, it reduces vaginal epithelial keratinization and accelerates the shedding of vaginal epithelial cells. Sixthly, it has the positive feedback effect of enhancing estrogen, on the peak of ovulation, while inhibiting the secretion of gonadotropins in the middle of menstruation. In other aspects it also promotes the development of mammary follicles, while promoting water and sodium excretion, and can increase basal body temperature by 0.3 to 0.5 degrees.