Ellie, I'm talking mostly about dried herbs, but also some supplements like gingko, astralagus, kava etc, just because they are natural does not mean they are innocuous and without side effects, and may interact with your prescribed meds, you just have to be careful and aware of the possible side effects for ex if you take gingko you should be aware that it thins your blood and you should stop taking it before having surgery, and you should be aware that recent studies indicate that it may not improve memory after all...