Source Naturals - Ginkgo-24 Ginkgo Biloba Extract 120 mg. - 120 Tablets Source Naturals Ginkgo-24 Ginkgo Biloba Extract is a standardized concentration of prime quality Ginkgo biloba leaves. The extraction yields 24% ginkgo flavone glycosides (the key nutrients) from a 50 to 1 concentration. The Gin