Safety and Efficacy Profile of Echinacea purpurea to Prevent Common Cold Episodes: A Randomized, Double-Blind, Placebo-Controlled Trial.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/23024696
Conclusion of this study
Compliant prophylactic intake of E. purpurea over a 4-month period appeared to provide a positive risk to benefit ratio.
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