Dietary Supplement Herbal Factors® 24% Ginkgo Flavonglycosides 6% Terpene Lactones Memory & Mental Performance Purity & Potency GuaranteedThis special formulation is guaranteed to contain standardized ginkgo flavonglycosides (24%) and terpene lactones (6%). Natural Factors Ginkgo Biloba is ideal for seniors and younger persons with active lifestyles.