They may fear giving progesterone
because of all the side effects caused by
synthetic progestins, and may not be aware that natural progesterone, unlike
synthetic progestins, is remarkably free of side effects when given in normal physiologic doses.
Testosterone and SHBG were measured in serum from all blood samples collected, while estradiol and progesterone were measured among 76 women not currently using hormonal contraceptives
because hormonal contraceptives contains
synthetic forms of estrogen and / or
progestin (40), which may influence endogenous levels of estrogens and progesterone.