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Adverse events associated with dietary supplements: an observational study

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Authors
Palmer, Mary E
Haller, Christine
McKinney, Patrick E
Klein-Schwartz, Wendy
Tschirgi, Anne
Smolinske, Susan C
Woolf, Alan
Sprague, Bruce M
Ko, Richard
Everson, Gary
Nelson, Lewis S
Dodd-Butera, Teresa
Bartlett, W Dana
Landzberg, Brian R
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Issue Date
2003-01-11

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Citation
Lancet 2003, 361(9352):101-6
Abstract
BACKGROUND: Adverse events associated with dietary supplements are difficult to monitor in the USA, because such products are not registered before sale, and there is little information about their content and safety. METHODS: In 1998, 11 poison control centres in the USA recorded details of 2332 telephone calls about 1466 ingestions of dietary supplements, in 784 of which patients had symptoms. We used a multitiered review process (kappa 0.42) to select 489 cases for whom we were at least 50% certain that their negative events were associated with dietary supplements. We aimed to assess the effects of multiple ingredients and long-term use, and collated data for patterns of use and information resources. FINDINGS: A third of events were of greater than mild severity. We noted both new and previously reported associations that included myocardial infarction, liver failure, bleeding, seizures, and death. Increased symptom severity was associated with use of several ingredients, long-term use, and age. Paediatric exposures were more often unintentional than were adult ingestions, and treatment of disease was the reason for supplement use in at least 28% of reports. Most products and ingredients were not identified in the information database (Poisindex) used by poison control centres, and specific adverse events were reported variably among five additional sources. INTERPRETATION: Dietary supplements are associated with adverse events that include all levels of severity, organ systems, and age groups. Associations between adverse events and ingredients are difficult to verify if a product has more than one ingredient, and because of incomplete information systems. Research into hazards and risks of dietary supplements should be a priority.
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http://www.sciencedirect.com/science/article/B6T1B-47N592R-8/2/841ac56b552affab9c9d4b0107098a1d
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