If you are one of the older member of the population who keeps taking the herbal supplement ginkgo biloba...you may want to throw it away, as the largest and longest study on it didn't show benefits against Alzheimer's disease and other age-related dementias.

A little more than 3,000 elderly people who did not have Alzheimer's at the start of the study took either ginkgo biloba or a placebo for an average of six years.

In the Nov. 19 issue of The Journal of the American Medical Association, researchers report that the herbal supplement showed no evidence of reducing the overall incidence of either Alzheimer's disease or dementia.

Well that's not good to hear, considering the popularity of ginkgo biloba among seniors. Read more from WebMD.