Nutrition Care Ginkgo Biloba 2:1 is a practitioner-only, alcohol-free liquid herbal extract prepared from the leaf of Ginkgo biloba at a 2:1 extraction ratio. Traditionally used in Western Herbal Medicine, Ginkgo supports healthy cognitive function, memory, and peripheral circulation. It is also valued for its antioxidant properties and its ability to help maintain healthy blood flow to the brain and extremities.