Nature's Sunshine Ginkgo Hawthorn provides antioxidant support to improve circulation. Ginkgo biloba leaf is one of the most popular and well-studied herbs in the world. Its ability to support circulation has been documented in numerous clinical trials. Ginkgo is a powerful free-radical scavenger. It may also help support blood flow to the extremities. Hawthorn berries contains flavonoids and other compounds that may benefit the circulatory system.