The dietary supplement echinacea is displayed in a shop Monday, Dec. 20, 2010, in Seattle. The largest study of the popular herbal remedy echinacea finds it won't help you get over a cold any sooner. The study of more than 700 adults and children suggests the tiniest hint of a possible benefit, about a half day shaved off a weeklong cold and slightly milder symptoms. But that could have occurred by chance. (AP Photo/Elaine Thompson)

Associated Press
The dietary supplement echinacea is displayed in a shop Monday, Dec. 20, 2010, in Seattle. The largest study of the popular herbal remedy echinacea finds it won't help you get over a cold any sooner. The study of more than 700 adults and children suggests the tiniest hint of a possible benefit, about a half day shaved off a weeklong cold and slightly milder symptoms. But that could have occurred by chance. (AP Photo/Elaine Thompson)
The dietary supplement echinacea is displayed in a shop Monday, Dec. 20, 2010, in Seattle. The largest study of the popular herbal remedy echinacea finds it won't help you get over a cold any sooner. The study of more than 700 adults and children suggests the tiniest hint of a possible benefit, about a half day shaved off a weeklong cold and slightly milder symptoms. But that could have occurred by chance.
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