Ginkgo Biloba
Also known as: Ginkgo, Maidenhair tree
Ginkgo biloba leaf extract is widely marketed around memory and cognitive wellness. NCCIH is clear that there is no conclusive evidence it helps any health condition, and the large NIH-funded Ginkgo Evaluation of Memory study (3,000+ adults aged 75+ over six years) found no difference from placebo in developing dementia. The main safety point is that ginkgo may increase bleeding risk in people taking anticoagulants such as warfarin. It is informational here, not a treatment for memory or any condition.
Snapshot
What this page can tell you: What NCCIH says about ginkgo — that there's no conclusive benefit for any condition (including a null dementia trial) and that it carries a bleeding caution.
What it cannot: That ginkgo improves memory or prevents dementia — NCCIH found no conclusive benefit. Informational only.
🧩 Stack insights — how this fits into a schedule
Memory / dementia evidence — NCCIH: there's no conclusive evidence ginkgo helps any health condition, and the large NIH-funded GEM study found no dementia benefit (it did not slow or reduce dementia onset). Not a treatment claim.
Anticoagulants (e.g. warfarin) / surgery — NCCIH: ginkgo may increase bleeding risk in people taking anticoagulants such as warfarin. Mention it before surgery. (Raw or roasted ginkgo seeds — distinct from leaf extract — are toxic.)
Bleeding / surgery caution category.
Relationship insights are informational only — they describe what is commonly discussed or studied, not what you should take. Not medical advice; review your routine with a clinician or pharmacist.
🕒 Timing
When: With a meal
Food: With food
Commonly taken with food; timing is otherwise flexible.
💊 Common use range
Standardized leaf extracts vary by product
No formal upper limit; note that raw and roasted ginkgo seeds (distinct from leaf extract) are toxic — follow product guidance.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
🤔 Worth considering?
Evidence vs. effort: Limited evidence relative to burden
Popular for memory, but NCCIH found no conclusive benefit for any condition, and a 3,000+ person trial showed no dementia benefit. The main safety issue is bleeding risk with blood thinners and before surgery; raw or improperly prepared seeds are toxic.
A general summary, not a recommendation. Whether something fits your situation is worth discussing with a healthcare professional.
⚠️ Commonly noted interactions (supplements)
None listed.
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
Ask a clinician or pharmacist before use.
- Bleeding / surgery caution category
- Pregnancy / breastfeeding caution
- Anticoagulant (blood thinner) interaction
- Antiplatelet interaction
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🩺 Medication caution categories
- Blood thinners (anticoagulants)
- Antiplatelet medication
- Pregnancy or nursing (health condition)
🏥 Surgery & procedure caution
Because ginkgo may increase bleeding risk, tell your surgical team about it well before any scheduled procedure.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
None listed.
🔁 Alternatives
None listed.
🗣️ Questions for a professional
- I take a blood thinner or have surgery coming up — is ginkgo safe to use or should I avoid it?
🛡️ Safety notes (source-reviewed)
- NCCIH: may increase bleeding risk with anticoagulants such as warfarin — mention before surgery.
- Side effects: dizziness, GI symptoms, headache.
- Raw or roasted ginkgo SEEDS (not leaf extract) are toxic; may be unsafe in pregnancy (early labor / delivery bleeding).
⚖️ Evidence limitations
- NCCIH: the large NIH-funded GEM study (3,000+ adults) found no dementia benefit; no conclusive benefit for any condition.
❓ Frequently asked
Does ginkgo improve memory or prevent dementia?
NCCIH says there's no conclusive evidence ginkgo helps any condition, and the large GEM study found it did not prevent or slow dementia. This page makes no treatment claim.
Is ginkgo safe with blood thinners?
NCCIH notes ginkgo may increase bleeding risk in people taking anticoagulants such as warfarin. Review it with a clinician, and mention it before surgery.
🔬 Evidence snapshot
NCCIH states there is no conclusive evidence that ginkgo is helpful for any health condition, and the large NIH-funded GEM study found it did not prevent or slow dementia. Its main practical caution is bleeding risk with anticoagulants.
🚦 Commonly noted cautions (auto)
Pregnancy / nursing caution category. This item carries a pregnancy/nursing caution category. If you are pregnant, nursing, or planning pregnancy, consider discussing it with a healthcare professional. This is a general caution, not a diagnosis or medical instruction.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
Evidence vs. burden: Limited evidence relative to burden
😐 Commonly reported side effects
- Dizziness, gastrointestinal symptoms, headache
- Raw or roasted ginkgo SEEDS (not leaf extract) are toxic and can cause serious effects
Non-exhaustive and individual.
🔄 Cycling & breaks
No established cycling pattern.
📅 Daily use notes
If you take anticoagulants or have a procedure scheduled, discuss ginkgo with a professional — it may increase bleeding risk. Use standardized leaf extract, not seeds.
📋 Source review status
Source-reviewed — last reviewed 2026-07-03
Reviewed against the NCCIH ginkgo page; editorial pass still pending.
Research backlog (queries to verify):
- ginkgo biloba GEM study dementia prevention outcome
- ginkgo bleeding anticoagulant interaction evidence
📚 References
- NCCIH — GinkgoNCCIH — Verified no-conclusive-benefit statement and null GEM dementia trial; bleeding risk with warfarin/anticoagulants and surgery; toxicity of raw/roasted seeds; dizziness/GI/headache side effects; pregnancy (early labor / delivery bleeding) caution.
Verified against the source shown. See the research-status page for how review works.
Use the web planner · StackWise (Android) in closed testing →