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Ginkgo

Ginkgo

Best for

Slower dementia progression

Probably helps 9.6–240 mg/day 11–317 weeks 4 trials · at least 4,248 people · 7 reviews #2 of 24 studied

Ginkgo likely benefits thinking in people with dementia, with modest improvements across cognitive tasks rather than a dependable focus boost for healthy adults.

Median effective dose, most-studied outcomes

  • Preserve thinking in dementia or MCI 180 mg 11–317 wk
  • Plan tasks and adapt to change 240 mg 8–317 wk
  • Recall information across tasks 200 mg 8–317 wk
Full protocol, 10 outcomes

Risk, worst reported severity

  • hemorrhagic stroke severe
  • intracranial hemorrhage severe
  • clopidogrel major
  • warfarin major
All 18 events and interactions

What ginkgo actually does

Outcome Effect Evidence Dose Time Rank
Clear benefits 2
Slower dementia progression Probably helps Memory, attention, and reasoning can affect familiar tasks and the ability to manage daily life with dementia.
moderate 		4 trials · at least 4,248 people · 7 reviews 9.6–240 mg 11–317 wk #2 /24
Better blood flow Probably helps Blood flow carries oxygen to the whole body, and flexible blood vessels help it keep moving.
moderate 		1 trial · 294 people · 1 review 240–300 mg 16–317 wk #3 /42
Modest benefits 1
Less dizziness and vertigo Helps Dizziness can feel like unsteadiness or lightheadedness; vertigo can feel like you or the room is moving.
— 		1 review of 5 trials · 1,040 people 120–240 mg 12–24 wk #1 /3
Early research 5
Faster thinking speed Unclear if it helps Quick thinking can help you keep up when a task or conversation moves at a brisk pace.
trivial 		1 trial · 75 people 60–240 mg 1–24 wk —
Longer maximum walking distance Unclear if it helps Maximum walking distance is how far a person with leg pain from poor blood flow can walk before the pain forces them to stop.
trivial 		1 trial · 62 people 300 mg 16 wk —
Lower dementia risk Studies disagree Dementia can affect memory, judgment, and independence in everyday life.
— 		2 trials · at least 5,923 people · 1 review 240 mg 317 wk #2 /2
Stronger memory Unclear if it helps Picking up new things and keeping details in mind can make conversations, plans and skills easier.
— 		3 trials · 3,345 people 120–240 mg 8–317 wk —
Less distress from tinnitus Unclear if it helps Ringing or buzzing without an outside sound can interrupt focus, rest, and everyday activities.
— 		1 trial · at least 85 people · 1 review 120–240 mg 12–26 wk —
Doesn't appear to help 3
Better overall thinking Probably doesn't help Clear thinking matters across the everyday tasks that call for attention, memory, and judgment.
trivial 		3 trials · 3,342 people 120–240 mg 24–317 wk —
Better planning & self-control Probably doesn't help Thinking skills help with planning, managing attention and working through everyday decisions and tasks.
trivial 		1 trial · at least 3,069 people · 1 review 120–240 mg 8–317 wk —
Sharper focus Probably doesn't help Focus that takes less effort can make work, conversations and everyday plans easier to follow.
trivial 		1 review of 8 trials · 910 people 60–120 mg 1–317 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

For the clearest use case, trials of thinking in dementia commonly used standardized ginkgo extracts in the 120 to 240 mg/day range, often for about 24 weeks or longer.13 Studies of executive control and processing speed also generally fall within 120 to 240 mg/day, but their effects are trivial to small, so higher doses do not guarantee a noticeable difference.1 Ginkgo did not prevent dementia in a long-term trial using 240 mg/day.2

When and how long

Use ginkgo consistently each day if you and your clinician decide it fits, because cognition trials measured changes after weeks or months, not after a single dose.1 Research does not establish a best morning or evening schedule. Taking it with a meal is a practical option if it bothers your stomach, but trial results do not show that meal timing drives the cognitive effect.1

Forms & standardisation

Look for a leaf extract that clearly names its standardization, especially EGb 761 or an equivalent extract with stated flavone glycoside and terpene lactone content. This matters because the dementia trials largely tested standardized extracts, not plain powdered ginkgo leaf or an unspecified blend.13 Avoid products made from ginkgo seeds, which are not interchangeable with the researched leaf extracts.4

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Preserve thinking in dementia or MCI 19.2–1,200 mg 180 mg 11–317 wk 18 papers 29 sig. endpoints
Plan tasks and adapt to change 120–240 mg 240 mg 8–317 wk 6 papers 6 sig. endpoints
Recall information across tasks 120–240 mg 200 mg 8–317 wk 5 papers 11 sig. endpoints
Handle information faster 60–240 mg 130 mg 1–24 wk 4 papers 4 sig. endpoints
Hold focus through repetitive work 60–120 mg 60 mg 1–317 wk 3 papers 1 sig. endpoint
Move with less spinning 60–240 mg 120 mg 12–26 wk 3 papers 5 sig. endpoints
Handle daily tasks with steadier thinking 120 mg — 23–317 wk 2 papers
Reduce dementia risk over time 240 mg 240 mg 317 wk 1 paper 1 sig. endpoint
Reduce Alzheimer's risk 240 mg — 317 wk 1 paper
Solve problems with clearer reasoning 120 mg — — 1 paper

Adverse events and drug interactions

Safety events

hemorrhagic stroke severe
intracranial hemorrhage severe
angina pectoris severe
ventricular arrhythmia severe
coma severe
recurrent seizures severe
priapism severe
Hepatocellular carcinoma / carcinogenicity (animal) severe

Drug interactions

clopidogrel major increases toxicity
warfarin major increases effect
warfarin major increases toxicity
ticlopidine major additive
antiepileptic drugs (valproate, phenytoin, others) major decreases concentration
antithrombotic agents major increases toxicity
risperidone major increases concentration
trazodone major increases toxicity
valproate major decreases concentration
various anticonvulsants (phenytoin, carbamazepine) major decreases concentration
Buy well

Recommended Ginkgo products

Real products that dose Ginkgo where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Ginkgo dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • Two studies (n=3,352) assessed cognitive performance across tasks, with positive results in people with dementia.1
  • Ginkgo evidence reviewed here spans 48 papers and 82 outcomes, including prevention and healthy-adult questions.
  • Randomized evidence does not establish dementia prevention, despite cognitive benefits in symptomatic populations.2

Ginkgo comes from the fan-shaped leaves of one of the world’s oldest tree species. Supplements use leaf extracts, not the edible seeds, which carry different safety concerns. Most clinical research centers on a refined leaf extract called EGb 761.1

Ginkgo leaf extract contains flavone glycosides and terpene lactones that researchers study for their effects on blood-vessel signaling and how brain cells handle oxidative stress.1 Picture it as tuning the brain’s delivery roads and cleanup crew, rather than flipping on a stimulant switch. Trials show changes in some cognitive outcomes, but they do not establish one proven biological explanation for those changes.1

Bottom line

Ginkgo makes the most sense for someone discussing support for cognitive symptoms of dementia with a clinician, where the evidence shows a modest benefit rather than a dramatic change.1 It is not a proven dementia-prevention supplement, and healthy adults should not expect reliable focus or memory gains.2 Skip self-treatment if you use blood-thinning or antiplatelet medicines, or have a bleeding-risk history, unless a clinician specifically clears it.4

Frequently asked

Common questions

Does ginkgo biloba improve memory?

The evidence does not establish a reliable memory boost for healthy people. Research shows a modest benefit for thinking abilities in people with dementia, while memory findings across other groups remain early and inconsistent.1

Can ginkgo biloba prevent dementia?

No. A large long-term trial found that ginkgo did not reduce new cases of dementia or Alzheimer’s disease.2

How long does ginkgo take to work?

Cognitive trials generally assessed results after weeks rather than days. Studies in dementia often ran about 24 weeks, so ginkgo is not an occasional-use supplement.1

Can you take ginkgo with blood thinners?

Do not start ginkgo without clinician guidance if you take an anticoagulant or antiplatelet medicine. Ginkgo can raise bleeding risk, and reputable safety guidance flags this interaction.4

Sources

Sources

  1. 1. Ginkgo biloba for cognitive impairment and dementia (2009) ↑
  2. 2. Ginkgo biloba for prevention of dementia: a randomized controlled trial (2008) ↑
  3. 3. Ginkgo biloba extract EGb 761 in dementia with neuropsychiatric features: a randomised, placebo-controlled trial (2007) ↑
  4. 4. Ginkgo

Generated August 27, 2026

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