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 powerful antioxidant activity in in vitro studies.