HealthGate.com: Vitamins, Minerals, Herbs and Dietary Supplements

National Library of Medicine: MEDLINEplus: Dietary Supplements

National Institutes of Health (NIH): Vitamins and Minerals

NIH: International Bibliographic Information on Dietary Supplements (IBIDS) database

NIH - Office of Dietary Supplements: Consumer information and links

The Natural Pharmacist: TNP.com: Herbs and Supplements

USDA Food and Nutrition Information Center: Dietary Reference Intakes (DRI) and Recommended Dietary Allowances (RDA)

USDA Food and Nutrition Information Center: Dietary Supplements and Herbal Information

USDA Food and Nutrition Information Center: Vitamins and Minerals

U.S. FDA - Center for Food Safety and Applied Nutrition: Dietary Supplements