24% Ginkgosides 6% Diterpenes. Promotes Cerebral Circulation. Standardized Herbal Supplement. Ginkgo biloba leaf and diterpenes are well known for their roles in promoting healthy circulation to the brain and to the extremities. In addition the herb serves as a potent antioxidant. Ginkgo’s effectiveness is attributed to flavonoid glycosides which help explain the herb’s broad range of beneficial properties on the body.