Of course, we said there were two testosterone related Winstrol side-effects , the first being testosterone suppression and the second being testicular atrophy. As testosterone is manufactured in the testicles, when production is suppressed the testicles simply atrophy. They do not shrink and disappear; in-fact, in some cases the difference may not be all that noticeable. When we’re speaking of testicular atrophy we’re simply referring to the testicles losing some of their fullness. Once the use of all anabolic steroids has been discontinued and all the hormones are out of your system natural testosterone production will begin again, and your testicles will return to their normal size.