Ginko BilobaGinko Biloba Extract (Flavonoids) Ginko has two groups of active substances, Flavonoids and Terpene Lactones, including ginkgolides A, B, and C, bilobalide, quercetin, and kaempferol. The ginkgolides have been shown to control inflammation. Ginkgo also acts as a powerful antioxidant and contributes to the oxidation of free radicals which are believed to contribute to premature aging.