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)
Traditional recommendations include ginkgo products containing 24% flavoglycosides (also called flavone glycosides or flavones) and 6% terpenes: 80-240 milligrams of a 50:1 standardized leaf extract daily, or 3-6 milliliters of a 40 milligram per milliliter liquid extract in 2-3 divided doses, or 30-40 milligrams of extract in a tea bag, prepared as a tea, for at least 4-6 weeks. There is a lack of evidence in support of the clinical benefit of small concentrations of ginkgo found in fortified foods. All doses above are oral unless otherwise stated. Beneficial effects may take 4-6 weeks to appear. Ginkgo seeds are potentially toxic and should be avoided. The intravenous ginkgo product Tebonin®, which was available in Germany, was removed from the German market due to significant adverse effects.
40-240 milligrams of extract, tincture, or powder has been taken by mouth daily, divided into two or three doses. Beneficial effects may take 4-6 weeks to appear. Patients have also been treated with intravenous ginkgo preparations: 0.7 milligrams of intravenous extract per minute for 120 minutes; 100 milligrams of ginkgo in 500 cubic centimeters of normal saline, administered twice daily; 20 milliliters of ginkgo in 250 milliliters of normal saline daily for four weeks; and 200 milligrams of EGb 761 infusion for 10 days, followed by a twice-daily oral dose of 80 milligrams for 12 weeks.
Children (under 18 years old)
Dyslexia : A single 80 milligram dose of EGb 761 daily for an average of 34.4 days.