What is the difference between Biestrogen and Triestrogen? By Jason Lovoy on 2015-01-26 in Hormone Replacement Therapy There are three types of estrogens: Estrone (E1), Estradiol (E2) and Estriol (E3). Biestrogen consists of 20% Estradiol and 80% Estriol. Triestrogen consists of 10% Estrone, 10% Estradiol, and 80% Estriol.
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