Ginkgo is believed to have nootropic properties, and is mainly used as memory and concentration enhancer, and antivertigo agent. However, studies differ about its efficacy. The largest and longest independent clinical trial to assess Ginkgo biloba published the finding in 2008 that the supplement does not reduce incidence of all-cause dementia or Alzheimer's disease in adults 75 years or older who had normal cognition or mild cognitive impairment when given a twice-daily dose of 120 mg extract of G. biloba.
