A worthwhile thing to keep in mind whether it's for tea, supplements, or whatever, is that medication is based on things that were observed from "natural" sources.

For example, willow bark was/is/has been used for pain and inflammation. It also contains salicin which is similar to acetysalicylic acid, which you'll know better as aspirin.

Does that mean all the things people say do a thing work? Not at all. Do some of them have varying degrees of effect of some percentage of people? Yes.