Ginkgo Biloba Extract is the extract of the leaves of the common ginkgo biloba tree. The standardized ginkgo biloba extract (GBE) requires a 50:1 ratio of leaves to extract, and extraction of GBE from the leaves is a very long process. The resulting extract contains ginkgo flavonglycosides (bioflavonoids) and terpene lactones as its active parts. Ginkgo Biloba Extract is used for several purported benefits include supporting mental acuity, circulation, and eye health, and for help in addressing age-related memory decline, ringing in the ear and low mood.