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No cure for the common cold
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  1. K Hattotuwa
  1. Broomfield Hospital, Chelmsford, Essex; Hattotuwa@aol.com

https://doi.org/10.1136/thorax.58.3.230

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    ▴ Barrett BP, Brown RL, Locken K, et al. Treatment of the common cold with unrefined Echinacea. A randomized, double-blind, placebo-controlled trial. Ann Intern Med2002;137:939–46
    OpenUrlPubMedWeb of Science

    Previous studies of Echinacea have reported success varying from 10% to 50% in the treatment of colds. A few randomised trials have reported only a small effect in preventing colds.

    In this randomised, double blind, placebo controlled study the authors report on the effect of 10 days …

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