Additional Prescription/Supplement Information

MedlinePlus: Drug, Herb and Supplement Information

http://www.nlm.nih.gov/medlineplus/druginformation.html

Published by the U.S. National Library of Medicine and the National Institutes of Health.

Natural Standard

http://www.naturalstandard.com/

Natural Standard is an international research collaboration that aggregates and synthesizes data on complementary and alternative therapies. (from their about us page)

Dietary Supplements Labels Database

http://dietarysupplements.nlm.nih.gov/dietary/

U.S. National Library of Medicine database on 2000+ dietary supplements.