Gingko Biloba Dosing The below doses are based on scientific research, publications, traditional use, or expert opinion. Many herbs and supplements have not been thoroughly tested, and safety and effectiveness may not be proven. Brands may be made differently, with variable ingredients, even within the same brand. The below doses may not apply to all products. You should read product labels, and discuss doses with a qualified healthcare provider before starting therapy. Adults (over 18 years old) For age-associated memory impairment (AAMI), 240-600 milligrams of ginkgo extract (EGb 761® or ginkgobene®) has been taken by mouth for up to 42 weeks. Ginkgo in a dosage of 0.9-1.9 milliliters has been taken by mouth three times daily. Additionally, 120 milligrams of ginkgo extract has been taken by mouth twice daily for 6.1 years. For altitude (mountain) sickness, 160 milligrams of ginkgo (EGb 761®) once daily or 120 milligrams of ginkgo twice daily has been taken by mouth for 4-...