Cognitive Health Dietary Supplement Supports Circulation and May Reduce Mental Fatigue With PureLeaf Ginkgo Biloba Gluten Free Nutrition Non Gmo Gingko acts as an antioxidant involved in respiratory, gastrointestinal and dermatological health due to its ability to increase blood flow to central and peripheral organs. Pureleaf Ginkgo Biloba Extract is of the highest quality which includes the most extensive testing at every stage of manufacturing to assure purity.