Ginkgo B™ is an extract from the cultivated leaves of the Ginkgo Tree. In clinical studies have shown ginkgo to benefit short-term memory, cardiovascular health, respiratory health and gastrointestinal health*. All ginkgo formulas must have adequate levels of ginkgolide B in order to successfully increase cerebral blood flow*. While some manufacturers provide 0.8%-1.0% ginkgolide B, this product has a minimum of 3.0% ginkgolide B.