Echinacea for treating the common cold: a randomized trial.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/21173411
Conclusion of this study
Illness duration and severity were not statistically significant with echinacea compared with placebo. These results do not support the ability of this dose of the echinacea formulation to substantively change the course of the common cold.
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Health conditions analyzed in this study
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