The following doses have been studied in scientific research:
For anxiety: 80 mg or 160 mg of a ginkgo leaf extract called EGb 761 has been taken three times per day for 4 weeks.
For dementia: 60-480 mg per day of ginkgo leaf extract ,divided in two or three doses, has been taken for up to one year. The most commonly studied dose is 120-240 mg per day with 240 mg possibly being more effective. Most of the clinical studies on the effectiveness of ginkgo leaf for dementia have used the standardized extracts EGb 761 (Dr. Willmar Schwabe Pharmaceuticals and Ipsen) and LI 1370 (Lichtwer Pharma).
For retinal damage caused by diabetes: 120 mg of a ginkgo leaf extract called EGb 761 has been taken daily for 6 months.
For walking leg pain related to poor circulation (claudication, peripheral vascular disease): 120-240 mg per day of ginkgo leaf extract (EGb 761), divided into two or three doses, has been used for up to 6.1 years. The higher dose may be more effective.
For dizziness (vertigo): 160 mg of a ginkgo leaf extract called EGb 761 has been taken once daily or in two divided doses daily for 3 months.
For premenstrual syndrome (PMS): 80 mg of a ginkgo leaf extract called EGb 761 has been taken twice daily, starting on the sixteenth day of the menstrual cycle until the fifth day of the next cycle. Also 40 mg of a ginkgo leaf extract called Ginko T.D. has been taken three times daily starting on the sixteenth day of the menstrual cycle until the fifth day of the next cycle.
For vision loss related to glaucoma: 120 to 160 mg of ginkgo leaf extract has been taken in two or three divided doses per day for up to 12.3 years.
For schizophrenia: 120-360 mg of a ginkgo leaf extract called EGb 761 (Yi Kang Ning, Yang Zi Jiang Pharmaceuticals Ltd., Jiangsu, China) has been used daily for 8-16 weeks.
For the movement disorder called tardive dyskinesia: 80 mg of a ginkgo leaf extract called EGb 761, three times daily for 12 weeks, has been used.
For all uses, start at a lower dose of not more than 120 mg per day to avoid gastrointestinal (GI) side effects. Increase to higher doses indicated as needed. Dosing may vary depending on the specific formulation used. Most researchers used specific standardized Ginkgo biloba leaf extracts. Some people take 0.5 mL of a standard 1:5 tincture of the crude ginkgo leaf three times daily.
You should avoid crude ginkgo plant parts. These can contain dangerous levels of the toxic chemicals found in the seed of the plant and elsewhere. These chemicals can cause severe allergic reactions.
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