1. http://nccam.nih.gov/health/herbsataglance.htm National Center for Complementary and Alternative Medicine site on herbs.
2. www.cfsan.fda.gov/~dms/ds-savvy.html Good overall patient handout regarding safe use of supplements.
3. www.naturaldatabase.com Subscription site offering up-to-date monographs on most popular supplements; lists ingredients for different commercial products and allows search by indication as well. Evidence for efficacy rated when available.
4. www.consumerlab.com Charges small subscription fee, which is used to support research evaluating whether or not supplements contain the components their labels claim. Findings can often be a concern from a product quality standpoint.
5. www.naturalstandard.com Subscription site with excellent bibliographic data for various supplements.