In a trial of 719 people with new colds, illness ran 6.34 days on blinded echinacea versus 6.87 on blinded placebo, and severity scores also favored echinacea. Media reports framed the result as no significant benefit; changes in interleukin-8 and neutrophil counts were not significant.
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Echinacea to chicken soup: How to combat the common cold
In a trial of more than 700 people aged 12 to 80 in Dane County, Wisconsin, those given echinacea saw their week-long colds shortened by 7 to 10 hours and reported slightly milder symptoms. Immune function did not differ between those who took it and those who did not.
Supplements
Echinacea, vitamin C help common cold?
In a trial of 719 people with early cold symptoms, echinacea shortened illness by seven to 10 hours, a difference the researchers did not treat as significant, and did not ease severity. A 2007 Lancet Infectious Diseases review had reported larger benefits.
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