I found some comments about this paper:
"The theory goes that Winstrol (winny) can bind and compete for a position at the progesterone receptor much like Clomid of Nolvadex would at the estrogen receptor, thereby inhibiting progestagenic effects. Now, progesterone can aggravate estrogenic side-effects by agonizing estrogen and it does play a role in gyno.
We also discussed that certain steroids may indeed stimulate and act at the height of the progesterone receptor including nandrolone and Norethandrolone. These hormones are also altered by it inducing a decrease in libido and a sense of lethargy and such, and eventhough they aromatize in lesser rates than some other steroids, they show an equal capability to cause estrogenic side-effects, particularly when stacked with other aromatizable compounds. Now there is evidence that Winstrol (winny) does indeed bind to the progesterone receptor1 and its users do not indicate the normal characteristics of progesterone stimulation, which bodes well for these anti-progestagenic properties. There is also some clinical data that it does aid in symptoms that require progesterone suppression2. Much in the way danazol was also successfully used. The one thing we shouldn't lose sight of however is in what rate it binds to the progesterone reception. There is no data on this. For all we know it couldn't bind strong enough to compete with nandrolone or norethandrolone. So its not wise to state that Winstrol (winny) is an anti-progestagin per se, but it does make Winstrol (winny) a good match for these products in stacks in any case."
