Re: James....

"if the body's other ... mechanisms... are working properly"

that "if" is as rare as hens teeth these days.

That is a matter of opinion.  It does not take much to stay healthy and keep the system working properly.  For example avoiding stress as much as possible, not taking excess levels of poisonous substances like Lugol's iodine, filling in gaps in the diet with a well varied diet, etc.