Does ginkgo biloba improve memory?
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
What the big trials found about ginkgo and memory, its mixed dementia evidence, and the bleeding risk to know.
Key takeaways
- Ginkgo shows little benefit for memory in healthy people and mixed results in dementia.
- It did not prevent dementia in a large prevention trial, and mostly failed tinnitus trials.
- It can thin the blood — a real caution with blood thinners or before surgery.
What ginkgo is
Ginkgo biloba, from one of the oldest tree species on Earth, is among the most popular herbal memory supplements. Standardised leaf extracts (a well-known one is EGb 761) are marketed to improve circulation to the brain and act as antioxidants. It has a long history of use and a large body of research — which, unusually for a supplement, means we have a fairly clear picture of what it does and doesn't do.
Memory in healthy people
For boosting memory in healthy adults, the evidence is largely disappointing. Well-designed trials have generally found little or no meaningful benefit on memory or cognition in people without a diagnosed condition. So the common 'sharpen your memory' marketing for ginkgo isn't well supported, and a healthy person hoping for noticeably better recall is likely to be underwhelmed.
Dementia and cognitive decline
In dementia, the picture is mixed. Some studies of standardised ginkgo extracts have suggested modest benefits for symptoms in people with dementia, while a large prevention trial found ginkgo did not prevent dementia or cognitive decline in older adults. The honest summary is inconsistent evidence and no proven prevention — it's not a treatment you should rely on, and it shouldn't replace medical care.
Tinnitus and circulation claims
Ginkgo is also sold for tinnitus and various circulation complaints. For tinnitus specifically, the better trials have mostly found it no better than placebo. Its circulation marketing rests largely on mechanism rather than strong outcome data. Across these uses, ginkgo tends to be a case of plausible theory outrunning convincing results.
The bleeding risk that matters
The most important safety point is that ginkgo can thin the blood. Combined with blood thinners (like warfarin or aspirin) or other supplements that affect bleeding, or before surgery, this raises a genuine risk, so it should be used cautiously and disclosed to your doctor. One more practical note: only standardised leaf extract should be used — ginkgo seeds are toxic and should never be eaten.
The verdict
On the evidence, ginkgo is unlikely to sharpen a healthy person's memory, has inconsistent results in dementia, and carries a real bleeding interaction. If you're considering it, weigh that modest-at-best benefit against the interaction risk, tell your doctor — especially if you take blood thinners or have surgery coming up — and keep expectations low.
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Frequently asked questions
Does ginkgo improve memory?
In healthy people, well-designed trials show little or no meaningful memory benefit, despite the marketing.
Does ginkgo help dementia?
The evidence is mixed and it did not prevent dementia in a large prevention trial, so it shouldn't replace medical care.
Is ginkgo safe?
It can thin the blood, so it's a real caution with blood thinners or before surgery — tell your doctor.
Can I eat ginkgo seeds?
No — ginkgo seeds are toxic. Only standardised leaf extract is used in supplements.
This article is general information, not medical advice. See our medical disclaimer, and talk to a qualified healthcare professional about your own situation.