1. Echinacea No Better Than Placebo at Decreasing Cold Duration, Severity The common cold is the most frequent human illness. There is no cure for the common cold, but symptoms such as congestion, sore throat, and fever usually spontaneously resolve themselves in about seven to 10 days. Some over-the-counter treatments may reduce symptoms, but none has been proven to shorten illness duration. Echinacea, an herbal treatment, has been widely used to treat the cold, but its efficacy is a source of debate... 
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