One being Prolactin/Progestone and the 19-nors,
And the other being in regards to Anadrol and it's mentioned as a Progesterone raising compound and Winstrol as an "protectant":
Off the top of my head regarding Prolactin raising with 19-nors, I believe it might mostly have to do with endogenous suppression of Progesterone caused by the exogenous effect and stimulation from the Progestins causing one to reduce endogenous production which would lead to:
~Decreasing T3 (which in itself will allow Prolactin to raise and thyroid is part of the regulation process)
~Potential mood swings
~Night Sweats
~Lack of energy
~Potential raise in SHBG which could signal the increase in production/sensitivity of estrogen receptors and potentially lower dht conversion
Most of the symptoms of low progesterone are similar to the sides of Tren. Hmm?
Other ways of increasing Prolactin a few various routes:
~Increased Estrogen
~Manually stimulating one's nipples, lol
~Decreased Thyroid
~Decreased Dopamine
~Having an orgasm (temporary though, but then again Prolactin is quickly destroyed and pulsates in it's levels greatly regardless)
Excessive Progesterone can cause many bad things too, and being that 19-nors act as progestins, they could be selective like SERMS are and act as high progesterone in some tissues and areas and shut-down natural progesterone and in some tissues/areas have that effect? Remember that a progestin is a synthetic progestogen that has some biological activity similar to progesterone dependant on the progestin and independant of progesterone.
I personally find that including 3 steps in my cycling eliminate most sides from Tren:
1) control estrogen through an AI
2) include a dht
+ one of the following:
~optimize T3 with 50mcg or so of Cytomel
~run Dbol
~run Dostinex
Usually I do the T3 and Dbol, which I feel is a badass addition to Tren, even if it doesn't increase dopamine, which empirically it seems to.
I know it is said that Anadrol is a progestin, which it is not - it is a dht compound and some say that is increases levels of progesterone, which dependant on estrogen, exerts progestronic sides. I haven't really seen the evidence for that, but it does seem almost convincing from an empirical stand point from the many who claim to have gotten gyno from it. So maybe somehow a DHT-based compound can increase progesterone by a great amount? I don't see how though.
As far as estrogen, Anadrol cannot aromatize. It is possible that it could compromise liver clearance of estrogen, allowing more in the system and more problems when using an aromatizing steroid. I think there is something being overlooked though:
The reasons I know of that Winstrol seems to be a good candidate with Anadrol would be by some of it's nature in countering estrogen/progesterone which include: SHBG lowering -the high SHBG lowering causes the faster destruction of estrogen and without an increase in estrogen leads to a lowering by that effect.
Winstrol causes a great effect of this at the liver and going with Anadrol comprismising estrogen clearance there, we have a good reason in itself. Given that it appears that Anadrol blocks estrogen clearance at the liver and winstrol enhances estrogen clearance at the liver I would assume that would be the answer. It's probably not that Anadrol has any progesterone-like effects, but rather reduces the destruction and clearance of estrogen greatly, allowing endogenous levels to raise far above normal.
The other thing I could see is if it were possible that Anadrol did increase progesterone levels, Winstrol(dht) helps prevent estrogen-dependent augmentation of progesterone receptors, which is, as far as I can see the only way that progestins are capable of causing 'progesteronic' sides anyway.