TWO for ONE. 50:1. Rich in Ginkgolides. Supports Antioxidant Status & Circulation. Vegan / Vegetarian. Non-GMO. Jarrow Formulas® Ginkgo Biloba is a 50:1 leaf extract standardized to 24% ginkgoflavonglycosides (or heterosides) and a minimum of 6% terpene lactones. Ginkgo Biloba has a wide range of beneficial effects including circulatory and antioxidant support.