And I don't buy the Rad-X/Radaway theory because Maximus' squire friend gets turned into a ghoul by taking the drug.
i was gonna bring that up but tbh i can't remember if it's been concretely established that it will
turn out to be a ghoul he's becoming, or if there's a possibility it might be a super mutant, or something else. ghouls aren't known for having a general healing factor for just any wounds.