Julie Jarvis wrote:

>Anyone have any good reference books on the
>safety of different common herbals?

The Net place where this is discussed is alt.folklore.herbs. The newsgroup
has two enormous FAQs compiled by Henriette Kress. You can find them at:

  http://metalab.unc.edu/herbmed/mediherb.html
  http://sunsite.unc.edu/herbmed/culiherb.html

One could also do a DejaNews Power Search on just that newsgroup and using
the complete archive.

Don.