Ginkgo biloba extract is a well-defined and complex product prepared from green leaves of Ginkgo biloba. The extract contains flavonoid substances, such as the Ginkgo-flavone glycosides and terponoids which are characteristic of Ginkgo and have a unique structure (ginkgolides, bilobalide). The mode of culture, harvesting and extraction are perfectly standardized and controlled. The leaves are commonly included in supplements and taken by mouth for memory problems. It seems to improve blood circulation, and might also act as an antioxidant to slow down changes in the brain. It's commonly taken by mouth for memory and thought problems, vision problems.