<p>For thousands of years, leaves from the Ginkgo biloba tree have been a common remedy in Chinese medicine. Nutricost's Ginkgo Biloba Extract is always from the finest quality available worldwide.</p> <p> <i>Ginkgo supplements are generally considered safe. In some individuals, they can cause nausea, headache, dizziness, and diarrhea. If you take any other supplements or medicines regularly, including blood-thinners or aspirin, talk to your health care professional before you start ginkgo supplementation.</i></p>