What chemicals in the body cause psychosis if ingested?

Alright so through the magical wonders of youtube I somehow ended up here.

First off, beg my pardon, but What the fuck you crazy bitch???

This is seriously messed up, but aside from that, they mentioned 8 chemicals in the body that can cause psychosis. I’m interested in this, what are they, how do they react in the brain, is it all of them combines or just a few, etc. I enjoyed psychology class and we did study the chemical makeup of the brain a bit, but never covered this.