St. John's wort, the widely used herbal remedy, appears ineffective for treating patients with moderate depression, according to federal researchers who conducted a comprehensive study of the product.
The study, which immediately drew criticism, is meant to guide millions of Americans who use the herb -- about $140 million worth of pills, tablets and preparations with St. John's wort are estimated to have been sold last year in the United States.
Supporters of St. John's wort immediately criticized the study, charging it was flawed and a waste of money.
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