Concentrated Ginkgo Biloba Extract. For nearly 2800 years the Chinese have used extracts from the ginkgo biloba tree to treat a variety of conditions. Reflex Nutrition's ginkgo extract (6% terpene lactone) is prepared from the dried leaves of the ginkgo biloba tree. Reflex Ginkgo Biloba is available in the following amounts: 90 capsules- 90 day supply based on recommended dosage. Dosage Directions for use: Take 1 capsule daily. Or as prescribed by a health practitioner.