Anyway I disagree with your claim of neurotoxicity which you don't justify. If you make a claim, back it up otherwise it's FUD.
Here's some actual data mostly opposing that, and a very interesting story of the US government keeping a pet researcher who'll report whatever they want <https://thedea.org/mdma-risks-science-and-statistics-technic.... It's a good read.
> Also cannot/should not take it more than a few times a year with at least 3-4 months between doses.
Justify this. With facts.