Got the sniffles? The largest study of the popular herbal remedy echinacea finds it won?t help you get better any sooner. The study of more than 700 adults and children suggests the tiniest possible benefit _ about a half-day shaved off a weeklong cold and slightly milder symptoms. But that could have occurred by chance. With government funding, Dr. Bruce Barrett and colleagues at the University of Wisconsin tackled the question again, using newspaper ads and posters to find volunteers with colds in the Madison, Wis., area.
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