Ginkgo biloba is an extract from the leaves of the ginkgo biloba tree. It is an herbal medicine that has been used for multiple conditions and is generally well tolerated, but case reports suggest it should be used with caution in patients with blood clotting disorders and those on anticoagulants because gingko leaves are believed to contain compounds that thin blood. Gingko biloba has been examined for its effect on cognitive impairment in individuals with cancer.

Wong, C. (2012). Gingko—What you need to know. Retrieved April 1, 2013, from http://altmedicine.about.com/cs/herbsvitaminsek/a/Ginkgo.htm