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Does Echinacea work?

Researchers infected 399 people with the common cold, isolated them in hotel rooms, then watched their symptoms, according to a study in the New England Journal of Medicine. Some subjects began taking Echinacea in advance, other only took it after they got sick and a third group took a placebo the whole time. Echinacea had no measurable effect, and the scientists concluded that it doesn't prevent or treat a cold.

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