Ginkgo (Ginkgo biloba), also spelled gingko and known as the Maidenhair Tree, is a unique species of tree with no close living relatives. The tree is widely cultivated and introduced, since an early period in human history, and ginkgo biloba extract has various uses as a food and traditional medicine.

Ginkgo biloba's most powerful effect is on the circulating system. Ginkgo flavenoids directly dilate the smallest segment of the circulating system, the micro-capillaries, which increase both blood circulation and oxygen levels in the brain as well as in other critical organ tissues.