Ginkgo biloba for Preventing Cognitive Decline in Older AdultsA Randomized Trial

Abstract
Ginkgo biloba is marketed widely and used with the hope of improving, preventing, or delaying cognitive impairment associated with aging and neurodegenerative disorders such as Alzheimer disease. The primary outcome analysis from the Ginkgo Evaluation of Memory (GEM) study, the largest completed randomized, double-blind, placebo-controlled dementia prevention trial to date,1 found that G biloba, 120 mg twice daily, was not effective in reducing the incidence of Alzheimer dementia or dementia overall.