Ginkgo Won't Prevent Heart Attack, Stroke in Elders

Among people aged 75 and older, the herbal supplement Ginkgo biloba does not prevent heart attacks, stroke, or death, a new study finds. There is some evidence that the popular herbal remedy might help prevent the leg-circulation problem known as peripheral artery disease, however.

Ginkgo contains nutrients called flavonoids, which are also found in fruits, vegetables, dark chocolate, and red wine, and are believed to offer some protection against cardiovascular events, the researchers say. The supplement, which is popular in the United States and Europe, has been touted to improve memory, and to prevent dementia, heart disease, and stroke.

However, "ginkgo had no benefit in preventing heart attack or stroke," says study lead researcher Lewis H. Kuller, MD, DrPH, distinguished university professor of public health and professor of epidemiology at the University of Pittsburgh.

"But, surprising to us, was that the results were consistent with the observations in Europe that ginkgo appeared to have some benefit in preventing peripheral vascular disease," he says.

This could be due to flavonoids acting as both antioxidants and also causing blood vessels to expand, Kuller says.

The report is online in Circulation. Last year the same University of Pittsburgh team reported that ginkgo biloba had no effect on preventing dementia. For their latest study, Kuller's group randomly assigned 3,069 patients to 120 mg of highly purified ginkgo biloba or placebo, twice a day as part of the Ginkgo Evaluation of Memory Study.

Over the six years of the trial, 385 participants died, 164 had heart attacks, 151 had strokes, 73 had mini-strokes ("transient ischemic attacks"), and 207 had chest pain, the researchers found.

There was no significant difference between those taking ginkgo or placebo for any of these outcomes, Kuller says.

However, among the 35 people who were treated for peripheral artery disease, 23 received placebo and 12 were taking ginkgo—a statistically significance difference, the researchers note.

— Source: Brigham and Women's Hospital