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Estradiol: Why You Should Care

Since this is a subject that comes up time and time again, I decided to start this thread so we can easily refer people to this information. From the beginning… Estradiol is an estrogen. It is known on blood tests as E2. Many people (even doctors) simply call it estrogen. Why it Matters There are basically two reasons we care about estradiol. The first is that E2 is a powerful testosterone receptor antagonist. What this means is that estradiol binds to androgen receptors and renders them us…