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Americans spent about $107 million on ginkgo biloba supplements in 2007, according to the Nutrition Business Journal. They're probably hoping to enhance memory and increase mental focus, claims often made for ginkgo.
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Ginkgo is extracted from the leaves of the Chinese maidenhair tree. Its seeds have been used in herbal medicines for thousands of years. The supplement is available in pills and teas and is commonly used in an effort to help prevent Alzheimer's disease and other forms of dementia.
But the results of a major trial published in the Nov. 19, 2008, issue of the Journal of the American Medical Association suggest that taking ginkgo biloba to prevent those conditions is probably a waste of money. Researchers followed more than ...