I don't think most of us here have tourette syndrome. I watched the video and could not find any relation to myself.
Dopamine is one of the other stuff that is deficient for most of us but the key seems to be gaba or its receptors when it comes SA.
Btw was that video based on a scientific research? You should research tourette syndrome or other things in pubmed and find out how tyrosine or dopamine is related to it.
There is a test I sent you may want to try it, it is interesting.