Promotes Antioxidant Status. Suitable for Vegetarians/Vegans. Circulation. 50:1. This product contains GinkgoSelect® which is produced by a patented multi-phase extraction process resulting in a standardized 24% ginkgoflavonglycoside (or heteroside) and a minimum of 6% terpene lactone extract. Ginkgo Biloba has a wide range of beneficial effects including circulatory and antioxidant support.