NOW Ginkgo Biloba is grown and extracted under the highest quality standards and is standardized to minimum 24% Ginkgoflavonglycosides and minimum 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 free radical scavenging activity in in vitro studies.