“...we don’t want to do anything that might interfere with the proven standards of treatment”
I’m always surprised by that. It doesn’t seem there really is any agreed-upon standard of treatment. Perhaps ask his doc to tell you exactly what treatment he is using on your son and then get some second opinions on that approach?
The one that gets the quack the most Benjamins.
If he used Ivermectin, there's a good chance the quack wouldn't get a cent.