Efficacy of a pelargonium sidoides preparation in patients with the common cold: a randomized, double blind, placebo-controlled clinical trial.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/18005909
Conclusion of this study
EPs represents an effective treatment of the common cold. It significantly reduces the severity of symptoms and shortens the duration of the common cold compared with placebo. The herbal drug is well tolerated.
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