Patients around the world looking for the Holy Grail in staving off cognitive impairment have been using ginkgo biloba for years, to the tune of $1 billion in annual sales worldwide. How strong is the data to support this use? Dr. Jeffrey Kaye, director of the National Institute on Aging's Layton Aging and Alzheimer's Disease Center and the Oregon Center for Aging and Technology at Oregon Health and Sciences University, joins host Dr. Leslie Lundt to review key points of current research on ginkgo biloba.