Certified Potency Ginko-Power From Japan is the highest quality and most effective form of Ginkgo Biloba leaf extract available in the world. It is standardized at the greatest concentration of naturally-balanced active and co-active constituents while retaining and enhancing all the holistic synergistic benefits. Fifty punds of premium leaves are concentrated into one pound of Ginkgo Extract. It is a rich source of Triterpene Lactones (Ginkgolides A, B, C, and Bilobalide) and bioflavonoids (Quercetin, Kaempferol, Isorhamnetin, and Flavonoids).