The tinnitus board on the internet is a depressing place to go. I have only gone once or twice. They try all kinds of things. You can probably find NAC posts there.
here is an interesting post. I guess maybe RLS is restless leg syndrome??? Something to watch out for if you take it
https://www.tinnitustalk.com/threads/n-acetylcysteine-nac.395/page-24#post-612421