At the 1h09 mark they start talking about psychedelics and stuttering. http://tim.blog/2015/03/21/james-fadiman/ Here is a person who claims he got cured by one trip. https://www.youtube.com/watch?v=mXvomNV7u9I&feature=youtu.be Here are some reddit threads: https://www.reddit.com/r/Psychonaut/comments/3cilx0/lsd_and_stuttering/ https://www.reddit.com/r/Psychonaut/comments/3n9abr/lsd_and_stuttering_follow_up/ and another link: http://www.rollitup.org/t/shrooms-cure-my-stutter.895665/ Yes most of these are anecdotal with no studies behind them but psychedelics are really powerful drugs that can rewire your brain so I think it wouldn't hurt to try it. In small to medium dosages these drugs are not harmful at all. If anybody wants to try it make sure you do your own research first ofcourse.