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Ginkgo biloba is a tree whose leaves are used in herbal supplements. Products commonly contain ginkgo leaf extract in tablets or capsules. It is promoted for memory and other health concerns, but no benefit has been conclusively established for any condition.
read more about ginkgo biloba ...People take ginkgo supplements for memory, concentration, and other concerns. Large studies have found that ginkgo does not prevent dementia. Evidence for improving cognition in healthy adults or treating other conditions remains inconclusive.
Ginkgo leaf extract contains several plant compounds studied for effects on cells and circulation. Those findings have not established a reliable treatment effect in people. The ingredients and amounts can differ across supplement products.
Ginkgo leaf extract is commonly sold as an oral supplement. Products have different strengths and directions, so check the individual label. Discuss use with a clinician or pharmacist if you take medicines or have a health condition.
Ginkgo leaf extract can cause headache, dizziness, or digestive symptoms. It can increase bleeding risk when taken with anticoagulants such as warfarin. Ginkgo seeds are toxic when eaten, and ginkgo supplements may be unsafe during pregnancy.
No. Large studies have not found that ginkgo supplements prevent dementia.
Research has not established a reliable memory benefit, especially in healthy adults. Results from studies of dementia symptoms are inconsistent.
Ask the prescribing clinician before combining them. Ginkgo can increase bleeding risk in people taking warfarin.
No. Fresh seeds are toxic, and serious effects have also been reported after eating roasted seeds.
Ginkgo biloba for cognitive impairment and dementia. PubMed. https://pubmed.ncbi.nlm.nih.gov/41641880/. Date Accessed October 6, 2026.
Ginkgo biloba for prevention of dementia: a randomized controlled trial. PubMed. https://pubmed.ncbi.nlm.nih.gov/19017911/. Date Accessed October 6, 2026.
Ginkgo: Usefulness and Safety. National Center for Complementary and Integrative Health. https://www.nccih.nih.gov/health/ginkgo/index.html. Date Accessed October 6, 2026.
Herb-Drug Interactions: What the Science Says. National Center for Complementary and Integrative Health. https://www.nccih.nih.gov/health/providers/digest/herb-drug-interactions-science. Date Accessed October 6, 2026.
The Ginkgo Evaluation of Memory (GEM) Study. National Center for Complementary and Integrative Health. https://www.nccih.nih.gov/health/the-ginkgo-evaluation-of-memory-gem-study. Date Accessed October 6, 2026.