http://dietary-supplements.info.nih.gov/Health_Information/IBIDS.aspx
Office of Dietary Supplements, National Institutes of Health
IBIDS is a database of published, international, scientific literature on dietary supplements that is available to the public free of charge. Scientists and the general public can browse this database to locate credible, scientific literature on dietary supplements. IBIDS is updated monthly and quarterly, depending on the publication frequency of the journals that are most frequently cited in IBIDS.