Promotes Neuro-Health by Increasing Cerebral Blood Circulation.The Ginkgo Biloba tree is the oldest tree species known to man. Today, worldwide studies reveal Ginkgo's role in promoting neuro-health by increasing cerebral blood circulation.* A 50:1 extract from the Ginkgo leaf is one of Europe's most popular supplements. Studies have shown that 120 mg per day of 24% extract is effective.