1. "International Bibliographic Information on Dietary Supplements":
http://odp.od.nihgov/ods/databases/ibids.html
This sites lists the best world wide known and used dietary supplements such as St. Johns Wart and Valerian. Great information resource for students, teachers, parents, etc., desiring information on dietary supplements.
2. "Alternative Health News Online":
Used mainly by lay adults who are interested in dietary supplements. Could be used by high school students for information on this topic.
3. "Dr. Duke's Phytochemical and Ethnobotanical Databases":
http://www.ars_grin.gov/duke/index.html
The most scientific index of complimentary drugs or more commonly known as dietary supplements. Could be used by college and high school students.
4. "Solgar"
This company produces high quality herbs, vitamins, minerals, and other nutritional supplements.