 So as long as you respect those kinds of proscriptions, then I think you're fairly safe in combining them, because they're basically safe herbs to begin with, and whether you combine them. There are, as a general rule, there are interactions with some herbs, and there are books, in fact, that cover the interactions of herbs with drugs, for example. So if you're being prescribed a certain drug, then there are some herbs that you probably should stay away from.