NOW Ginkgo Biloba is grown and extracted under the highest quality standards and is standardized to min. 24% Ginkgoflavonglycosides and min. 6% terpene lactones, including Ginkgolide B, the most significant fraction and Ginkgolides A, C and Bilobalide. Our Ginkgo Biloba Extract is the finest quality available worldwide. Scientific research has suggested that Ginkgo Biloba Extract has antioxidant activity in in vitro studies.* The benefits of Ginkgo biloba extract (GBE) are attributed primarily to two groups of active constituents: the ginkgo flavone glycosides and the terpene lactones. Ginkgo flavone glycosides, which typically make up approximately 24% of the extract.