Abstract
to the editor: The trial by Turner et al. (July 28 issue) 1 could have benefited from the inclusion of additional treatment groups with higher daily doses of echinacea. The dose equivalent of 900 mg of dried root derives from the German Commission E monograph for Echinacea pallida root, a different species from E. angustifolia. 2 E. angustifolia root is not officially approved and thus has no recommended dosage in Germany, owing to a lack of sufficient supporting data. The 1999 World Health Organization monograph on E. angustifolia root cites a 3-g daily dose, which is 330 percent of the dose used in this trial. 3 The 3-g daily dose is also recommended by the Canadian Natural Health Products Directorate. 4
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