Gingko Biloba and its extract, EGb761, have been widely promoted for a variety of functions, including the enhancement of learning and memory. A review of the results of studies in animals supports this assertion, but studies in humans have not had the statistical requirements for any definite conclusions. Multiple mechanisms of action have been proposed, most focusing on effects on the hippocampus; however, the exact nature of the effects of Gingko Biloba has yet to be determined. Because Gingko Biloba has various side effects, more research is needed in order to determine if supplementation would be truly beneficial.