Progesterone is the other hormone your ovaries make other than estrogen and its main function is to support pregnancy.
Progestogens can be either natural or synthetic.
Progestogens have been used for years in infertility treatment and to replace the natural progesterone in women with premature ovarian failure. Progestogens are used to treat abnormal uterine bleeding and for contraception in birth control pills. HRT consists of the hormone estrogen and, if your uterus has not been removed, progesterone. When a progestogen is added, the chance of uterine cancer is reduced below the base line level. One of estrogen's many benefits is its ability to reduce the risk of heart disease.