The health department is coming tommarow and then they are going to instruct the owner to get the mold remediated professionally.

So Calendula, Pau D'Arco tincture, Propolis tincture, and black walnut hull extract can be used internally and externally for cats?
And vinegar would be externally only?

And if you were going to give cats vitamin C to try to fight off these health problems, what would the dose be?