Extracts of Ginkgo biloba leaves produce reversible inhibition of rat
brain monoamine oxidase (MAO). Both MAO-A and -B types were inhibited
to a similar extent. The MAO inhibitory compound(s) were present in dr
ied or fresh Ginkgo biloba leaves as well as in commercially available
capsules of Ginkgo biloba and appear to be heat stable with relativel
y low molecular weight. MAO inhibition by Ginkgo biloba may be a mecha
nism underlying reported anti-stress and anxiolytic activities of this
natural product.