progesterone / estradiol (Pg / E2) ratio: fundamental balance or imbalance
between these two hormones; a low ratio indicates estrogen dominance
progestins:
synthetic hormones structurally similar to progesterone (e.g. Provera) but not naturally occurring in the body; they suppress normal ovarian production of progesterone and have been shown in studies to have negative side effects.
Martorano JT, Ahlgrimm M, Colbert T. Differentiating
between natural progesterone and
synthetic progestins: clinical implications for premenstrual syndrome and perimenopause management.