I delved a bit into how and why Zicam was allowed on the shelves when it was harming people. In my search I found that there are a ton of homeopathic products marketed and sold over-the-counter and that the regulatory agency over this is the homeopathic industry themselves.
Today I took a the trip down the rabbit hole though when I read Orac’s post on homeopathic plutonium. I encourage you to read through it as it is a good look at the historical reasoning of homeopathy and exposes the “provings” that are used to determine effectiveness of a treatment. Pretty scary stuff, and I hate that they have co-opted scientific language in order to confuse the public about their products.