There is no standard dose of ginkgo biloba supplements. However, in medical studies, almost all clinical trials have used a standardized extract of ginkgo, standardized to 24% flavone glycosides and 6% terpene lactones. A common dose in people with dementia is 40 milligrams of that extract three times daily. For improving cognitive function in healthy people, studies have used between 120 milligrams to 600 milligrams of the extract daily.