Ginkgo Biloba: Benefits, Dosage, Best Forms & Safety
Medical disclaimer: This article is for informational purposes only and is not medical advice. Individual results vary. Consult a healthcare professional before starting any supplement, especially if you take other medications or have a liver, kidney, heart, or thyroid condition.
Evidence Grade: B: Good Evidence
Large trials like GEM found no benefit for dementia prevention, but a meaningful body of evidence supports modest benefits for specific circulatory and peripheral symptoms, which is why the grade sits at good-but-mixed rather than strong.
What Is Ginkgo Biloba?
Ginkgo biloba is an extract from one of the oldest living tree species, standardized in most supplements to specific percentages of flavonoids and terpenoids (commonly labeled EGb 761). It is thought to work primarily by improving blood flow and providing antioxidant effects.
It has a long history of use in traditional Chinese medicine and became one of the best-selling herbal supplements in the West for memory and circulation, prompting substantial (and mixed) modern clinical research.
Evidence-Based Benefits
- May modestly improve symptoms of dementia and cognitive decline. Some meta-analyses of ginkgo extract in people with existing mild cognitive impairment or dementia show small improvements in cognitive test scores and daily functioning, though the effect sizes are modest and study quality varies considerably.
- Improves peripheral circulation symptoms. Randomized trials support ginkgo for intermittent claudication (leg pain from poor circulation during walking), with modest but measurable improvements in pain-free walking distance.
- Does not appear to prevent dementia in healthy older adults. The large, long-term Ginkgo Evaluation of Memory (GEM) study found no benefit of ginkgo for preventing dementia or Alzheimer’s disease in older adults with normal cognition or mild impairment, an important negative finding worth being upfront about.
- May help with tinnitus in some patients. Evidence is mixed, but some trials report modest symptom improvement in tinnitus linked to circulatory causes, while others show no significant benefit over placebo.
Dosage Guide
- Standard Dose: 120-240 mg/day of standardized extract (EGb 761), typically split into two doses.
- Upper Limit (UL): No formal NIH Upper Limit established; most trials do not exceed 240 mg/day.
- Timing: With meals to reduce mild GI upset; effects for circulation/cognition typically require several weeks of consistent use to assess.
- Notes: Look for products standardized to 24% flavone glycosides and 6% terpene lactones, the concentration used in most clinical research.
Drug & Supplement Interactions
- Blood thinners (warfarin, aspirin, DOACs) (High): Ginkgo has antiplatelet properties and has been associated with case reports of bleeding when combined with anticoagulant or antiplatelet medications; see our dedicated guide on taking ginkgo biloba with blood thinners before combining.
- NSAIDs (ibuprofen, naproxen) (Medium): Combined antiplatelet effects may modestly increase bleeding risk, particularly with regular NSAID use.
- Anticonvulsants (Medium): Ginkgo may lower the seizure threshold in rare cases and has been reported to interact with some seizure medications; caution is warranted for people with epilepsy.
- SSRIs/MAOIs (Low): Isolated case reports raise a theoretical concern about serotonin-related effects; clinically significant interactions appear rare but are not fully ruled out.
Safety & Side Effects
Mild headache, dizziness, and GI upset are the most commonly reported side effects. Raw ginkgo seeds (not the standardized leaf extract used in supplements) can be toxic and should never be consumed.
People on blood thinners, those with a bleeding disorder, and anyone scheduled for surgery should stop ginkgo at least 1-2 weeks beforehand and discuss it with their surgeon, given the bleeding-risk interactions above.
Bottom Line
Ginkgo biloba has real, if modest, evidence for peripheral circulation symptoms and possibly mild cognitive support in people who already have impairment, but it is not proven to prevent dementia in healthy adults. Its bleeding-risk interactions with blood thinners are the single most important safety consideration.
Frequently Asked Questions
Q: Does ginkgo biloba improve memory in healthy people?
A: Evidence for healthy, cognitively normal adults is weak; the strongest evidence is in people who already have some cognitive impairment or circulatory symptoms.
Q: Can I take ginkgo with blood thinners?
A: This combination carries a meaningful bleeding risk and should only be done under medical supervision. See our full breakdown for details.
Q: How long does it take ginkgo to work?
A: Most studies assess effects after 4-12 weeks of consistent daily use; it is not a fast-acting supplement.
Q: Is ginkgo safe to take long-term?
A: Standardized leaf extract has been used safely in trials lasting up to several years in the GEM study, though anyone on interacting medications should have regular medical follow-up.
Sources
- NCCIH: Ginkgo
- Ginkgo Evaluation of Memory (GEM) Study: JAMA
- Cochrane Database of Systematic Reviews: Ginkgo biloba for cognitive impairment and dementia
- Mayo Clinic: Ginkgo
- Cleveland Clinic: Ginkgo Biloba
These statements have not been evaluated by the Food and Drug Administration. This content is not intended to diagnose, treat, cure, or prevent any disease and is not a substitute for advice from your doctor or pharmacist.