The efficacy of Echinacea for preventing or treating viral infections remains contested; while some clinical trials and systematic reviews suggest modest benefits for reducing upper respiratory tract infection symptoms or frequency, large Cochrane reviews and other studies conclude the evidence is inconsistent and not definitively proven.
The evidence we hold leans evenly split
How this was weighed
official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x
Applications of the Phytomedicine<i>Echinacea purpurea</i>(P · peer-reviewed · supports · weight 1.6 · 2011
Safety and Efficacy Profile of Echinacea purpurea to Prevent · peer-reviewed · supports · weight 1.6 · 2012
Echinacea reduces antibiotic usage in children through respi · peer-reviewed · supports · weight 1.6 · 2021
Echinacea for preventing and treating the common cold · peer-reviewed · refutes · weight 2 · 2014
Echinacea for preventing and treating the common cold · peer-reviewed · refutes · weight 1.6 · 2006
Evaluation of Echinacea for Treatment of the Common Cold · peer-reviewed · refutes · weight 1.6 · 2000
Evidence for · 4
<i>Echinacea</i> species (<i>Echinacea angustifolia</i> (DC.) Hell., <i>Echinacea pallida</i> (Nutt.) Nutt., <i>Echinacea purpurea</i> (L.) Moench): a review of their chemistry, pharmacology and clinical properties
2005 · cited by 422
This review notes that several clinical trials report echinacea is superior to placebo for preventing and treating upper respiratory tract infections.
Evidence against · 3
Echinacea for preventing and treating the common cold
2014 · cited by 385
This comprehensive Cochrane review concludes that echinacea products have not been convincingly shown to provide benefits for treating or preventing colds.
See more details
More for · 3
Applications of the Phytomedicine<i>Echinacea purpurea</i>(Purple Coneflower) in Infectious Diseases
2011 · cited by 139
The study highlights that standardized echinacea preparations exhibit selective antiviral and immune-modulatory activities.
Safety and Efficacy Profile of Echinacea purpurea to Prevent Common Cold Episodes: A Randomized, Double-Blind, Placebo-Controlled Trial
2012 · cited by 84
This large randomized trial found that prophylactic intake of Echinacea purpurea reduced cold episodes and inhibited enveloped virus infections.
Echinacea reduces antibiotic usage in children through respiratory tract infection prevention: a randomized, blinded, controlled clinical trial
2021 · cited by 52
This recent trial demonstrated that echinacea effectively prevented viral respiratory tract infections and reduced secondary antibiotic usage in children.
More against · 2
Echinacea for preventing and treating the common cold
2006 · cited by 134
This earlier Cochrane review found that while some early treatment trials showed minor effects, preventative benefits and consistent treatment efficacy were not established.
Evaluation of Echinacea for Treatment of the Common Cold
2000 · cited by 87
This review highlights that clinical trial results regarding echinacea are mixed and often limited by methodological flaws and nonstandardized preparations.