Researchers from the University of Pittsburgh randomly assigned more than 3,000 adults older than 75 to take either 120 milligrams of ginkgo or inactive placebo pills twice a day. They found that over the next six years, the Ginkgo group had a lower risk of developing peripheral artery disease (PAD), a buildup of artery-clogging plaques in the legs that reduces blood flow and can lead to pain and cramps when a person walks. The finding is in line with past research showing that ginkgo supplements helped people with PAD walk farther without pain.