Studies using low dosages of this compound note minimal interferences with natural testosterone production. Likewise when it is used alone in small amounts there is typically no need for ancillary drugs like Clomid/Nolvadex or NCG. This has a lot to do with the fact that it does not convert to estrogen, which we know has an extremely profound effect on endogenous hormone production. Without estrogen to trigger negative feedback, we seem to note a higher threshold before inhibition is noted. But at higher dosages of course, a suppression of natural testosterone levels will still occur with this drug as with any anabolic/androgenic steroid.