N-acetylcysteine (NAC) for trichotillomania?

For a brief introduction to what N-acetylcysteine (NAC) is, see What is N-acetylcysteine (NAC)? NAC is not an FDA-approved treatment for any mental disorder. It is not even a firmly established treatment for any mental disorder. But, it has been tried for a dozen different mental disorders. Does it work? What about for trichotillomania? Several case…