A review of more than 700 studies has concluded that the herb has a substantial effect in preventing colds and in limiting their duration.
see NYTimes link:
http://www.nytimes.com/2007/07/24/health/24echi.html?ex=1343188800&en=a31563d6ba015c66&ei=5124&partner=permalink&exprod=permalink
From the The Lancet: Infectious Diseases
Evaluation of Echinacea for the Prevention and Treatment of the Common Cold: A Meta-Analysis
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