http://www.umm.edu/altmed/
This is a really good web site from the University of Maryland on herbs. I've used it a lot, and it has a lot of good information, and it lets you look up herbs for conditions. Because I'm not an herbologist, it's helped me evaluate herbal (and traditional) medical treatments.
It's very hard to find the alternative medical information from the main University of Maryland web site, I found this by accident. I hope it helps. You can look up all the herbs in Humaworm, or whatever wormer you choose, and find out quite a bit about it.