it wont lower it, but winstrol has been shown to bind to the progestin receptors, but not have any interaction with them, blocking them like a serm does to the estrogen receptor.
and my own experiments with pro dienolone (dienedrone) cycles, one with, and one without pstanz, had a dramatic difference in gyno sides, like none with pstanz, and puffy, leaky nips the first week without it.
I would also speculate this is why winstrol dry's people up so much in higher dosages, and why it's been recomended for ages as a must have for tren cycles to prevent sides.
the only actual data on the winstrol and progestin receptor was from a study done, and the results showed that the progestin receptor in the hands, was blocked by winstrol, but didn't have any interaction with the receptor.