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 demonstrated that Ginkgo Biloba Extract has antioxidant activity in in vitro studies. The medical 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, are primarily responsible for GBE's antioxidant activity and may mildly inhibit platelet aggregation (stickiness).