I doubt you're penis hasn shrunk if you've been taking Winnie as there are no estrogenic side effects with this drug, meaning it does not convert to estrogen in the male body. Hair loss can be common with any steroid and thats the risk you run, if the joints persist to hurt then i'd suggest something like cod liver oil capsules if you're adiment you want to keep taking Winstrol, if not, discontinue use.
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