English Estriol (medication) Cited by user Medgirl131 on 20 May 2018 Estetrol is a naturally occurring and bioidentical estrogen, or an agonist of the estrogen receptor, the biological target of estrogens like endogenous estradiol.
English Estriol Cited by user 207.233.85.251 on 23 Jun 2016 Estriol (E3), or oestriol, is one of the three main estrogens produced by the human body.