Dr Paul Clayton examines the claims of other products: WHAT ABOUT ECHINACEA?
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چکیده
Echinacea has been in the news lately, due to a series of studies that found it to be ineffective in protecting against respiratory tract infections such as coughs and colds (Grimm & Muller ’99, Barrett et al ’02, Kreutzfeld ’06). These were all randomised, double blind trials with reasonable numbers of trial subjects, so they cannot be lightly dismissed. In addition to these negative findings, three powerful meta-analyses all came to a similar conclusion; Echinacea is ineffective or not proven (Caruso & Gwaltney ’05, Carr & Nahata ’06, Linde et al ‘06).
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