Ginkgo Dosage: How Much (120-240 mg/day Standardized Extract)
Educational summary — not medical advice. Stop ginkgo 1–2 weeks before surgery and clear it with your clinician if you take anticoagulants or have a seizure disorder — see the safety section.
The honest answer
The studied dose is 120–240 mg/day of a standardized 24%/6% extract, split into 2–3 doses. The dementia-treatment signal used 240 mg/day of EGb 761 (Tan 2015). One caveat that reframes everything: the large prevention trials that failed also used 240 mg/day (GEM; GuidAge) — so dose isn't why they failed, and taking more won't buy you prevention. The mg only count if it's a standardized extract, not whole leaf.
The dose that matters is a standardized extract, not "ginkgo mg"
Ginkgo's studied effects come from a standardized extract — roughly 24% flavone glycosides and 6% terpene lactones — not from raw leaf weight. So the number that counts is milligrams of that extract, at 120–240 mg/day, typically divided across the day. A whole-leaf or "6,000 mg equivalent" product may show a big number while delivering an unknown amount of the actual studied actives, which is why a standardized extract — ideally the EGb 761 trial extract — is the only way to hit a dose that maps to the research.
| Question | Answer |
|---|---|
| How much? | 120–240 mg/day of a standardized 24%/6% extract |
| Best-supported dose? | 240 mg/day of EGb 761 — for treating mild-to-moderate dementia (Tan 2015) |
| Any point going higher than 240? | Little — 240 mg is the top of the studied range; more isn't better-supported |
| Will more prevent dementia? | No — 240 mg/day over 5–6 yr failed to prevent it (GEM; GuidAge) |
| Healthy-adult memory boost? | No — the independent evidence is null (see does it work) |
| How to take it? | Split into 2–3 doses; effects build over weeks. Stop 1–2 wk before surgery |
Why 240 mg is the treatment dose — but not a prevention loophole
The clearest positive evidence — benefits for cognition and daily function in people who already have mild-to-moderate dementia — used 240 mg/day of EGb 761, and some analyses report a dose-dependent pattern favoring 240 over lower doses (Gauthier 2014). It's tempting to read that as "more is better, so a high dose might prevent decline in healthy people." The trials shut that door: GEM (240 mg/day, ~6 years, 3,069 adults) and GuidAge (240 mg/day, 5 years, 2,854 adults) both used this exact dose and found no reduction in dementia (DeKosky 2008; Vellas 2012). So 240 mg is the right number if you're specifically targeting the modest treatment signal — and it is not a dose you can push higher to unlock prevention.
Dose calculator: are you in the studied range?
Enter the standardized extract mg per serving on your label and how many servings you take a day. This assumes a genuine standardized 24%/6% extract — if the label only says "whole-leaf" or "6,000 mg equivalent," the extract dose is unknown and this won't apply.
How to take it
- Target 120–240 mg/day of a standardized extract, usually split into 2–3 doses across the day.
- Use 240 mg/day only for the dementia-treatment signal — and know it's modest, extract-specific, and not a healthy-adult memory boost.
- Give it weeks. Trial effects built up over weeks to months, not acutely.
- Stop 1–2 weeks before surgery, and clear ginkgo with your clinician if you take anticoagulants/antiplatelets or have a seizure disorder (Bent 2005; Granger 2001).
Hitting the dose with the trial extract
If you want the dose that maps to the treatment evidence, that means EGb 761 — the only extract the positive trials used. The cheaper of the 2 EGb 761 products we track is below; the full tiered comparison is on best ginkgo.
120 mg of EGb 761 per serving (EGb 761 (Schwabe; 24% / 6%)) — two servings reaches the 240 mg treatment dose. The actual studied material, not a generic 24%/6%.
A generic 24%/6% extract, but one of the few that discloses its ginkgolic-acid limit (<5 ppm) — 120 mg/serving. Not the trial extract, but the cleanest generic on disclosure.
As an Amazon Associate we earn from qualifying purchases. Tiered by extract identity and ginkgolic-acid disclosure, never commissions.
Frequently asked questions
How much ginkgo should I take per day?
120–240 mg/day of a standardized 24%/6% extract, split into 2–3 doses. The dementia-treatment signal used 240 mg/day of EGb 761. Whole-leaf products don't deliver a known extract dose.
Is 240 mg better than 120 mg?
For treating existing dementia, 240 mg of EGb 761 is the better-supported dose (dose-dependent pattern). But it's no memory boost for healthy adults, and more won't unlock prevention.
Why did prevention trials fail if the dose was right?
It wasn't a dosing problem. GEM and GuidAge both used 240 mg/day over 5–6 years and still found no prevention. You can't fix prevention with a higher dose.
When and how should I take it?
Split into 2–3 doses; effects build over weeks. Stop 1–2 weeks before surgery, and clear it with your clinician if you take blood thinners or have a seizure disorder.
Related
- EGb 761 vs generic "24%/6%" — why the extract identity decides whether the mg mean anything
- Best ginkgo — every product by quality tier and cost per serving
- Does ginkgo work? — the null, the narrow treatment signal, and the safety
Sources
- Tan MS, et al. "Efficacy and adverse effects of ginkgo biloba for cognitive impairment and dementia." J Alzheimers Dis. 2015. PMID: 25114079 (EGb 761 240 mg/day).
- Gauthier S, Schlaefke S. "Efficacy and tolerability of ginkgo biloba extract EGb 761 in dementia." Clin Interv Aging. 2014. PMID: 25506211 (dose-dependent; manufacturer-affiliated — disclosed).
- DeKosky ST, et al. "Ginkgo biloba for prevention of dementia (GEM study)." JAMA. 2008. PMID: 19017911 (240 mg/day, n=3,069, ~6 yr; no prevention).
- Vellas B, et al. "Standardised ginkgo biloba extract for the prevention of Alzheimer's disease (GuidAge)." Lancet Neurol. 2012. PMID: 22959217 (240 mg/day, n=2,854, 5 yr; not significant).
- Bent S, et al. "Spontaneous bleeding associated with ginkgo biloba." J Gen Intern Med. 2005. PMID: 16050865 (bleeding case reports).
- Granger AS. "Ginkgo biloba precipitating epileptic seizures." Age Ageing. 2001. PMID: 11742783 (seizure caution).
- Full product dataset: /ginkgo/cost-by-brand.json (CC BY 4.0).