I agree with Hortensia. Herbs and vitamins are medicines, just as much as aspirin or prescriptions. Here's my beef with "natural" remedies. The use of the term "all natural" is a buzz word. All natural doesn't mean "all safe" or "completely effective". Arsenic is all natural, but we don't tout it as a remedy. Why? Because it has deadly side effects.
My point is that when "natural" or "herbal" remedies are a consideration, it's our natural tendency to assume that they can't harm us, because they are from nature. They can have serious side effects, not to mention that they can interact with each other in a dangerous way.
Another "beef" I have with herbal remedies is that they're not regulated by the FDA. The strength can vary greatly from one brand to another, as well as the filler ingredients. This is why someone can take one brand of an herbal with no problems, then buy another brand of the "identical" herbal and have side effects or a reaction to it. I believe herbals and supplements can be OK, but I certainly would be extremely cautious of the combinations and dosages of them. As a nurse, I often see herbals and supplements as a complicating factor in figuring out why patients complain of certain symptoms, or why their prescription medications may not be working as expected.