Ginkgo
Medicinal use of ginkgo can be traced back 5,000 years in Chinese herbal medicine. The action of the herb may help support the brain, central nervous system and impotence. Ginkgo is known for increasing blood flow to the brain which aids in mental function. The herb also increases blood flow to the genitals which improves sexual function.
In one study 78% of a group of men with impotence reported significant improvement without side effects. Ginkgo improves peripheral circulation and oxygenation.