While steroid abuse is dangerous, check out [The Dark Side Of Steroids and The Problem With Deadlifts by Doctor Mike and Dr Mike Israetel](https://youtu.be/UrzF-rhJtOs?si=RlH3ZYAdJnUiPjlC), TRT for those that actually need it (which means having low levels of testosterone and exhibits multiple symptoms of it) will experience more benefit than drawbacks from TRT. To cure stuttering? I don’t think there’s any peer-reviewed studies on the subject.