Which of the following statements about ginkgo biloba is true?

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Ginkgo biloba is an anticoagulant, which can increase the risk for internal bleeding as an individual gets older. One study of people over age 60 with no signs of memory impairment found that the ginkgo biloba supplement worked no better than a placebo on learning, memory, attention, concentration, naming, and verbal fluency outcomes. Another study noted that the use of ginkgo biloba did not result in less cognitive decline. In addition, ginkgo extract is expensive, requiring 50 pounds of dried leaves to make one pound of extract.

Which of the Following Statements About Ginkgo Biloba Is True