oral contraceptives / bypass surgery / dietary supplements / /
Organization
U.S. Department of Health and Human Services / National Institute of Health / U.S. Department of Agriculture / World Health Organization / U.S. Public Health Service / National Institute for Biological Standards and Control / U.S. Food and Drug Administration / Institute of Medicine / U.S. National Institute of Standards and Technology / Life Sciences Research Office / U.S. Centers for Disease Control and Prevention / office of Dietary Supplements / /