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Medicinal uses Extracts of Ginkgo leaves contain flavonoid glycosides and terpenoids (ginkgolides, bilobalides) and have been used pharmaceutically. These extracts are shown to exhibit reversible, non-selective monoamine oxidase inhibition, as well as inhibition of reuptake at the serotonin, dopamine, and norepinephrine transporters, with all but the norepinephrine reuptake inhibition fading in chronic exposure. Ginkgo supplements are usually taken in the range of 40–200 mg per day. Recently, a meta-analysis of clinical trials have shown Ginkgo to be moderately effective in improving cognition in dementia patients but not preventing the onset of Alzheimer's Disease in normal people.