Some steroids may cause temporary shrinkage, they are steroids which interact with the progesterone receptor. Nandralone, winstrol and tren are not good for your penis. In all my years on steroid forums and involved with people on roids i've never heard of one person permanently lose 2 inches or any inches from their their cock, not saying its impossible. I'm on testosterone now @500mg per week, my dick is bigger on it and normal off it. I think the size increase is to do with vasodilation.
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