There is no such thing as a designated progestin receptor (at least I've never heard of it). What I said was that Winstrol is the only compound proven to occupy the progesterone receptor without activating it (much like a SERM does for the ER).
Here's a study to get you started:
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And I learned it on a private AAS board from some guys who really know their ****.
thats and intersting study, i would like to read the whole thing. It's states the hands also contain progestin receptors (so now i guess you can say you've heard of it right?) and stanz seems to bind to them to inhibit some dna function, but doesnt seem to have an effect on collegen, and nether do the progestin receptors it binds to.
i need a subscription to pubmed. nice link. repped.
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also, 19-nor compounds such as pro dienolone, trenbolone are very strong androgenic/anabolic steroids, that do have some effect on the progestin receptor, but the only leads to possible enhanced estrogenic side effects.
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on another note, from reading suggestions from experienced lifters that know their sheet, as gator put it, I recently stacked non methylated stanz with pro dienolone, and has zero side effects, and pct went fine.
this wasn't the case the first time i tried to run pro dienolone. then I ran it with epistane, but first week in, my gyno flared up like fire, and the nipp was sore.
even after dropping the dosage in half, didn't help. (and I was stacking with epistane btw)
so I dropped the tren and epi, and finished up a bottle of hdrol i had. this is what gets rid of gyno symptoms on cycle for me, then went into a strong pct.
my last cycle was pro dien/pstanz and no gyno symptoms. btw.