Quite frankly, the contamination from pesticide and polluted air, water and dirt on everyday foods (and of course my herbs) are a bigger concern. They're ubiquitous and unavoidable, now, thanks to big business and apathetic, time-constrained, overworked individuals. So I'm not that concerned by home remedies, although I really only trust my own. Some herbalists/root medics add turpentine to their remedies, for internal use. So I'll stick to my own or vetted suppliers.