Researchers looked at eleven major medical journals, including the Journal of the American Medical Association, Canadian Medical Association Journal, British Medical Journal and the New England Journal of Medicine. They found that the journals who carry the most pharmaceutical ads were significantly more likely to publish articles claiming that natural supplements were unsafe. . . .  And the difference was huge. 67% of articles on natural supplements concluded that they were unsafe in the journals with the most pharmaceutical ads compared to only 7% in the ones with the middle amount of pharmaceutical ads and only 4% in those with the fewest. Further evidence of author bias comes from the fact that while only 2% of studies reported raised concerns about natural supplements being unsafe, 8.8% of editorials and reviews and 11% of other articles did.

  • BMC Complement Altern Med 2008;8:11

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