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Ginkgo Biloba
The Bottom Line
Ginkgo biloba is one of the most studied herbal supplements in history - and the results are largely disappointing for its most popular claim.
- Category
- Cognitive & Nootropics
- Best form
- Standardized extract (24% flavone glycosides, 6% terpene lactones)
- Effective dose
- 120-240mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones), divided into 2-3 doses
- Lab tested
- 7 of 10 products
What Is Ginkgo Biloba?
Ginkgo biloba is one of the most studied herbal supplements in history - and the results are largely disappointing for its most popular claim. The supplement is widely marketed for preventing cognitive decline and dementia, but the definitive trial on this question produced a clear negative result.
The Ginkgo Evaluation of Memory (GEM) study (DeKosky et al., JAMA 2008, n=3,069) was a landmark double-blind, placebo-controlled trial that followed adults aged 75+ for a median of 6.1 years. Participants took 240mg/day of EGb 761 (the gold-standard ginkgo extract). The result: ginkgo did not reduce the overall incidence of dementia or Alzheimer's disease compared to placebo. This was devastating for the supplement's primary marketing claim. A secondary analysis from the same trial (Snitz et al., JAMA 2009) also found no benefit for preventing cognitive decline in older adults with normal cognition or mild cognitive impairment.
The Cochrane systematic review by Weinmann et al. (2010) analyzed 36 trials of ginkgo for cognitive impairment and dementia. The findings were inconsistent and unconvincing - while some individual trials showed modest benefits, the overall evidence was not strong enough to recommend ginkgo for treating or preventing dementia. Effect sizes were small and clinical meaningfulness was questionable.
For healthy younger adults hoping to boost memory or focus, the evidence is similarly weak. Laws et al. (2012) conducted a meta-analysis of ginkgo's effects on cognitive function in healthy individuals and found no consistent benefit for attention, memory, or executive function.
Where ginkgo shows its strongest (though still modest) evidence is in peripheral circulation. Several trials have shown small improvements in walking distance for patients with intermittent claudication (leg pain from poor circulation), though the effect sizes are modest and more recent reviews have questioned whether the benefits are clinically meaningful. There is also limited evidence suggesting benefit for tinnitus and SSRI-induced sexual dysfunction, but the data is mixed and the trials are small.
The bottom line: ginkgo biloba has been studied extensively, and the bulk of high-quality evidence says it does not prevent dementia, does not meaningfully improve cognition in healthy people, and has only modest effects on peripheral circulation. It is not dangerous for most people, but the marketing dramatically overpromises relative to what the science actually shows.
Does It Work? The Evidence
Prevention of dementia or Alzheimer's disease
IneffectiveGEM study (DeKosky et al., JAMA 2008, n=3,069): 240mg/day EGb 761 for 6.1 years did NOT reduce dementia incidence vs placebo; Snitz et al. 2009 secondary analysis confirmed no benefit for cognitive decline prevention
Cognitive enhancement in healthy adults
IneffectiveLaws et al. 2012 meta-analysis: no consistent benefit for attention, memory, or executive function in cognitively intact adults across multiple trials
Treatment of existing mild cognitive impairment or dementia symptoms
ConflictedWeinmann et al. 2010 Cochrane review of 36 trials: inconsistent results, some individual trials positive but overall evidence unconvincing; small effect sizes of questionable clinical significance
Peripheral circulation and intermittent claudication
Early SignalMultiple small-to-medium trials showing modest improvements in pain-free walking distance; Nicolai et al. 2013 Cochrane review found small but statistically significant benefit
Tinnitus relief
Not There YetHilton et al. 2013 Cochrane review: insufficient evidence to support or refute ginkgo for tinnitus; one large trial (Drew & Davies 2001) found no benefit
SSRI-induced sexual dysfunction
Not There YetSmall open-label studies showed promise; one double-blind RCT (Kang et al. 2002) found no significant benefit over placebo
| Claimed Benefit | Evidence Level | Key Studies | Our Verdict |
|---|---|---|---|
| Prevention of dementia or Alzheimer's disease | Strong | GEM study (DeKosky et al., JAMA 2008, n=3,069): 240mg/day EGb 761 for 6.1 years did NOT reduce dementia incidence vs placebo; Snitz et al. 2009 secondary analysis confirmed no benefit for cognitive decline prevention | Ineffective |
| Cognitive enhancement in healthy adults | Moderate | Laws et al. 2012 meta-analysis: no consistent benefit for attention, memory, or executive function in cognitively intact adults across multiple trials | Ineffective |
| Treatment of existing mild cognitive impairment or dementia symptoms | Moderate | Weinmann et al. 2010 Cochrane review of 36 trials: inconsistent results, some individual trials positive but overall evidence unconvincing; small effect sizes of questionable clinical significance | Conflicted |
| Peripheral circulation and intermittent claudication | Moderate | Multiple small-to-medium trials showing modest improvements in pain-free walking distance; Nicolai et al. 2013 Cochrane review found small but statistically significant benefit | Early Signal |
| Tinnitus relief | Limited | Hilton et al. 2013 Cochrane review: insufficient evidence to support or refute ginkgo for tinnitus; one large trial (Drew & Davies 2001) found no benefit | Not There Yet |
| SSRI-induced sexual dysfunction | Weak | Small open-label studies showed promise; one double-blind RCT (Kang et al. 2002) found no significant benefit over placebo | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: 120-240mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones), divided into 2-3 doses
Best forms: Standardized extract (24% flavone glycosides, 6% terpene lactones), EGb 761 (the specific extract used in most clinical trials), Standardized leaf extract in capsule or tablet form
Take 120-240mg daily of standardized extract (must be standardized to 24% flavone glycosides and 6% terpene lactones). Most clinical trials used divided doses (60-80mg taken 2-3 times daily with meals). Effects on circulation, if any, develop over 4-8 weeks of consistent use. Always choose a standardized extract rather than raw leaf powder, as the concentration of active compounds in unstandardized products is unreliable. Taking with food may reduce occasional gastrointestinal side effects.
Who Should Take Ginkgo Biloba?
Individuals with peripheral arterial disease or intermittent claudication who want to explore an adjunct supplement alongside standard medical treatment. Older adults with existing mild cognitive impairment who have discussed it with their doctor and understand the evidence is mixed at best. People who have already tried first-line interventions for circulation and are looking for modest additional support.
Who Should Avoid It?
Anyone taking blood-thinning medications (warfarin, aspirin, clopidogrel, direct oral anticoagulants) - ginkgo has antiplatelet properties and increases bleeding risk. This is not a theoretical concern; case reports of serious bleeding events exist. People scheduled for surgery should stop ginkgo at least 2 weeks beforehand. Individuals with seizure disorders (ginkgo contains ginkgotoxin, which can lower the seizure threshold, particularly in poorly standardized products). Pregnant or breastfeeding women. Anyone expecting ginkgo to prevent dementia - the evidence clearly says it does not.
Side Effects & Safety
Generally well-tolerated in standardized extracts at recommended doses. Common side effects include headache, dizziness, gastrointestinal upset, and allergic skin reactions. The most serious risk is increased bleeding, especially when combined with anticoagulant or antiplatelet drugs. Rare but reported: allergic reactions in individuals sensitive to alkylphenols (cross-reactivity with poison ivy is possible). Unstandardized products may contain higher levels of ginkgolic acids, which are allergenic and potentially toxic - look for products that limit ginkgolic acid content to less than 5 ppm.
Product Scores
10 products scored on evidence quality, third-party testing, cost per effective dose, and ingredient transparency.
The Scorecard: 10 Products Compared
Extra Strength Ginkgo 120mg
Doctor's BestExcellent transparency - one of the few ginkgo products that explicitly discloses ginkgolic acid content (less than 5 ppm), matching the EGb 761 safety standard
120mg standardized extract at the clinical dose floor; limited overall evidence for ginkgo's marketed benefits
Third-party tested, GMP certified, well-established supplement brand with consistent quality track record
$0.06/day at 120mg - outstanding cost per dose for a tested product
Full disclosure of standardization (24/6), form, dose, and no proprietary blends; ginkgolic acid content listed as less than 5 ppm on product page
120mg standardized extract at the clinical dose floor; limited overall evidence for ginkgo's marketed benefits
Third-party tested, GMP certified, well-established supplement brand with consistent quality track record
$0.06/day at 120mg - outstanding cost per dose for a tested product
Full disclosure of standardization (24/6), form, dose, and no proprietary blends; ginkgolic acid content listed as less than 5 ppm on product page
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba 120mg Capsules
Nature's Bounty
USP Verified at an extremely low cost per dose - if you are going to try ginkgo, this is the product to start with. The quality assurance here is excellent even if the supplement's evidence is not.
120mg standardized extract reaches the minimum clinical dose; however, the overall evidence for ginkgo's primary claims is weak
USP verified for identity, potency, purity, and dissolution - the gold standard for supplement quality assurance
$0.05/day at 120mg - extremely affordable for a USP-verified product
Standardized to 24% flavone glycosides and 6% terpene lactones; USP verification adds label accuracy assurance; ginkgolic acid content not disclosed
120mg standardized extract reaches the minimum clinical dose; however, the overall evidence for ginkgo's primary claims is weak
USP verified for identity, potency, purity, and dissolution - the gold standard for supplement quality assurance
$0.05/day at 120mg - extremely affordable for a USP-verified product
Standardized to 24% flavone glycosides and 6% terpene lactones; USP verification adds label accuracy assurance; ginkgolic acid content not disclosed
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba Certified Extract 120mg
Life Extension365-capsule bottle is unusually large for this category, providing a full year's supply at 120mg/day; excellent transparency standards
120mg standardized extract at the clinical dose floor; the evidence for ginkgo as a cognitive enhancer is weak
GMP certified, brand has strong reputation for quality control and research-backed formulations; no USP or NSF product-level cert
$0.15/day at 120mg - slightly higher cost due to premium brand positioning but still very affordable in absolute terms
Excellent label disclosure including standardization, form, extraction method, and no fillers or proprietary blends; non-GMO verified
120mg standardized extract at the clinical dose floor; the evidence for ginkgo as a cognitive enhancer is weak
GMP certified, brand has strong reputation for quality control and research-backed formulations; no USP or NSF product-level cert
$0.15/day at 120mg - slightly higher cost due to premium brand positioning but still very affordable in absolute terms
Excellent label disclosure including standardization, form, extraction method, and no fillers or proprietary blends; non-GMO verified
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba 120mg Veg Capsules
NOW FoodsReliable mid-range option from one of the most established supplement brands; consistently well-reviewed for label accuracy
120mg standardized extract meets the minimum clinical dose; the evidence base for ginkgo remains weak overall
GMP certified (NPA A-rated), in-house lab tested for identity and potency, long-standing quality reputation
$0.07/day at 120mg - highly cost-effective for a GMP-certified product from a major brand
Clear standardization to 24% flavone glycosides and 6% terpene lactones; no proprietary blends; form and source clearly labeled
120mg standardized extract meets the minimum clinical dose; the evidence base for ginkgo remains weak overall
GMP certified (NPA A-rated), in-house lab tested for identity and potency, long-standing quality reputation
$0.07/day at 120mg - highly cost-effective for a GMP-certified product from a major brand
Clear standardization to 24% flavone glycosides and 6% terpene lactones; no proprietary blends; form and source clearly labeled
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba 120mg
Jarrow FormulasScience-oriented brand that clearly communicates the 50:1 extraction ratio and standardization; solid formulation at a fair price
120mg of 50:1 concentrated extract meets the clinical dose; underlying ginkgo evidence remains weak
GMP certified, established science-focused brand with a long track record; no independent third-party cert at the product level
$0.11/day at 120mg - slightly above the cheapest options but still very affordable
Specifies 50:1 concentration ratio and standardization; clear labeling of active compound percentages
120mg of 50:1 concentrated extract meets the clinical dose; underlying ginkgo evidence remains weak
GMP certified, established science-focused brand with a long track record; no independent third-party cert at the product level
$0.11/day at 120mg - slightly above the cheapest options but still very affordable
Specifies 50:1 concentration ratio and standardization; clear labeling of active compound percentages
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba 120mg
NutricostAbsurdly cheap at $0.04/day, but lacks the USP verification of Nature's Bounty or the ginkgolic acid disclosure of Doctor's Best - for a supplement this inexpensive, you get what you pay for on quality assurance
120mg standardized extract at clinical dose; ginkgo's marketed benefits are largely unsupported by high-quality evidence
ISO accredited third-party tested for purity, GMP certified; but no USP, NSF, or ConsumerLab verification at the product level
$0.04/day at 120mg - the lowest cost per effective dose in this comparison by a wide margin
Standardized to 24% flavone glycosides and 6% terpene lactones; basic but adequate labeling; ginkgolic acid content not disclosed
120mg standardized extract at clinical dose; ginkgo's marketed benefits are largely unsupported by high-quality evidence
ISO accredited third-party tested for purity, GMP certified; but no USP, NSF, or ConsumerLab verification at the product level
$0.04/day at 120mg - the lowest cost per effective dose in this comparison by a wide margin
Standardized to 24% flavone glycosides and 6% terpene lactones; basic but adequate labeling; ginkgolic acid content not disclosed
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgold 60mg Tablets
Nature's Way
Long-established US ginkgo brand with TRU-ID species authentication, but the 60mg dose means you need two tablets daily and pay more per effective dose
60mg per tablet requires 2 tablets/day to reach the 120mg clinical minimum; underlying ginkgo evidence is weak
TRU-ID certified for species authenticity, GMP certified; Ginkgold is a well-established ginkgo brand in the US market
$0.23/day at 120mg (2 tablets) - more expensive than competitors offering 120mg in a single capsule
Standardized to 24/6 with TRU-ID species verification; lower per-tablet dose means more flexible dosing but higher cost to reach clinical threshold
60mg per tablet requires 2 tablets/day to reach the 120mg clinical minimum; underlying ginkgo evidence is weak
TRU-ID certified for species authenticity, GMP certified; Ginkgold is a well-established ginkgo brand in the US market
$0.23/day at 120mg (2 tablets) - more expensive than competitors offering 120mg in a single capsule
Standardized to 24/6 with TRU-ID species verification; lower per-tablet dose means more flexible dosing but higher cost to reach clinical threshold
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba Leaf Extract 120mg
SolgarRespected heritage brand, but you are paying a significant premium for essentially the same standardized extract available elsewhere at one-fifth the cost
120mg standardized extract reaches clinical dose; ginkgo's evidence base for its popular claims is disappointing
GMP certified, premium heritage brand with decades of market presence; no independent third-party product certification
$0.26/day at 120mg - noticeably more expensive than competitors for an equivalent standardized extract
Clear standardization, no proprietary blends; premium glass bottle packaging but the extract itself is comparable to cheaper alternatives
120mg standardized extract reaches clinical dose; ginkgo's evidence base for its popular claims is disappointing
GMP certified, premium heritage brand with decades of market presence; no independent third-party product certification
$0.26/day at 120mg - noticeably more expensive than competitors for an equivalent standardized extract
Clear standardization, no proprietary blends; premium glass bottle packaging but the extract itself is comparable to cheaper alternatives
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Leaf Liquid Phyto-Caps
Gaia Herbs
Premium herbal brand with strong sourcing transparency via MeetYourHerbs, but the liquid extract format diverges from the standardized dry extract used in clinical research and costs 5-10x more per dose
Uses a liquid extract rather than the standardized dry extract format used in most clinical trials; dose equivalence to EGb 761 is unclear
Certified B Corp, Certified Organic herb sourcing, GMP certified; MeetYourHerbs traceability program allows supply chain verification
$0.50/day - significantly more expensive than standardized extract capsules providing equivalent or higher doses
Liquid phyto-cap format makes direct dose comparison to clinical trial extracts difficult; does not clearly state 24/6 standardization on all product listings
Uses a liquid extract rather than the standardized dry extract format used in most clinical trials; dose equivalence to EGb 761 is unclear
Certified B Corp, Certified Organic herb sourcing, GMP certified; MeetYourHerbs traceability program allows supply chain verification
$0.50/day - significantly more expensive than standardized extract capsules providing equivalent or higher doses
Liquid phyto-cap format makes direct dose comparison to clinical trial extracts difficult; does not clearly state 24/6 standardization on all product listings
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Ginkgo Biloba 120mg Tablets
Spring Valley
Budget Walmart brand that is cheap per dose but offers minimal quality assurance - no third-party testing, unclear standardization, and limited label transparency. For a supplement category where quality verification matters, this is a gamble.
120mg per tablet at the clinical dose; underlying evidence for ginkgo's most popular claims is weak
Walmart store brand with no independent third-party testing verified; no USP, NSF, or ConsumerLab certification; GMP status not prominently disclosed
$0.06/day at 120mg - very affordable, but quality uncertainty undermines the value proposition
Minimal information provided about extraction method, standardization specifics, or ginkgolic acid content; label does not clearly confirm 24/6 standardization on all sources
120mg per tablet at the clinical dose; underlying evidence for ginkgo's most popular claims is weak
Walmart store brand with no independent third-party testing verified; no USP, NSF, or ConsumerLab certification; GMP status not prominently disclosed
$0.06/day at 120mg - very affordable, but quality uncertainty undermines the value proposition
Minimal information provided about extraction method, standardization specifics, or ginkgolic acid content; label does not clearly confirm 24/6 standardization on all sources
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Extra Strength Ginkgo 120mg Doctor's Best | Ginkgo Biloba 120mg Capsules Nature's Bounty | Ginkgo Biloba Certified Extract 120mg Life Extension | Ginkgo Biloba 120mg Veg Capsules NOW Foods | Ginkgo Biloba 120mg Jarrow Formulas | Ginkgo Biloba 120mg Nutricost | Ginkgold 60mg Tablets Nature's Way | Ginkgo Biloba Leaf Extract 120mg Solgar | Ginkgo Leaf Liquid Phyto-Caps Gaia Herbs | Ginkgo Biloba 120mg Tablets Spring Valley |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | B+ | B | B | B | B | B- | B- | B- | C+ | C- |
| Evidence | C | C | C | C | C | C | C | C | C | C |
| Quality & Purity | B | B+ | B | B | B | C | B+ | B | B | D |
| Value | A | A | B | A | B+ | A | C | C | D | B |
| Transparency | A | B | A | B+ | B+ | C+ | B | B | B- | D |
| Cost/Day | $0.06 | $0.05 | $0.05 | $0.07 | $0.11 | $0.04Winner | $0.23 | $0.26 | $0.50 | $0.06 |
| Dose/Serving | 120mg | 120mg | 120mg | 120mg | 120mg | 120mg | 60mg | 120mg | 120mg | 120mg |
| Form | Ginkgo biloba standardized leaf extract (24% glycosides / 6% lactones) veggie capsule | Ginkgo biloba standardized leaf extract capsule | Ginkgo biloba certified standardized leaf extract capsule | Ginkgo biloba standardized leaf extract veg capsule | Ginkgo biloba leaf extract 50:1 (24% glycosides, 6% lactones) veggie capsule | Ginkgo biloba standardized leaf extract capsule | Ginkgo biloba standardized leaf extract tablet | Ginkgo biloba standardized leaf extract vegetable capsule | Ginkgo biloba leaf liquid phyto-cap (liquid extract in capsule) | Ginkgo biloba leaf extract tablet |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | ✓ Yes | No | ✓ Yes | No |
| Proprietary Blend | No | No | No | No | No | No | No | No | No | No |
Frequently Asked Questions
Does ginkgo biloba actually prevent dementia?
No. The largest and most rigorous trial ever conducted on this question - the GEM study (3,069 participants, 6+ years of follow-up) - found that ginkgo did not reduce the incidence of dementia or Alzheimer's disease compared to placebo. This is not a matter of insufficient evidence; the study was well-powered and definitive. Ginkgo's continued marketing for dementia prevention is not supported by the clinical data.
What does 'standardized to 24/6' mean on ginkgo labels?
This refers to the two main classes of active compounds: 24% flavone glycosides (antioxidant flavonoids) and 6% terpene lactones (ginkgolides and bilobalide, which affect blood flow and neuroprotection). This standardization ratio matches the EGb 761 extract used in the majority of clinical trials. Products that do not specify this standardization may contain variable amounts of active compounds.
Is ginkgo biloba safe to take with blood thinners?
No - this is the most important safety concern with ginkgo. It has antiplatelet properties that can potentiate blood-thinning medications like warfarin, aspirin, and clopidogrel, increasing the risk of bleeding. Case reports of serious bleeding events (including intracranial hemorrhage) have been reported in patients combining ginkgo with anticoagulants. Always consult your doctor before taking ginkgo if you are on any blood-thinning medication.
What is EGb 761 and why does it matter?
EGb 761 is a specific, patented standardized extract of Ginkgo biloba manufactured by Dr. Willmar Schwabe Pharmaceuticals. It is standardized to 24% flavone glycosides and 6% terpene lactones, with ginkgolic acid content limited to less than 5 ppm. The vast majority of clinical research on ginkgo has used this specific extract. While other products may match the 24/6 standardization, EGb 761 has the strongest research backing of any ginkgo preparation.
How long does ginkgo take to work?
Clinical trials measuring circulation benefits typically ran for 8-24 weeks before assessing outcomes. Cognitive trials ran for months to years. There is no evidence that ginkgo produces acute or rapid effects on cognition or blood flow. If you are going to try it, commit to at least 8 weeks of consistent use before evaluating whether you notice any benefit.
Is ginkgo worth taking for memory and focus?
For healthy adults looking to improve memory or focus, the evidence says no. Laws et al. (2012) meta-analysis found no consistent cognitive benefit in healthy individuals. There are better-supported options for cognitive enhancement, including regular exercise, adequate sleep, and supplements with stronger evidence like creatine or caffeine plus L-theanine.
Sources
- DeKosky ST, et al. Ginkgo biloba for prevention of dementia: a randomized controlled trial (GEM study). JAMA. 2008;300(19):2253-62.
- Snitz BE, et al. Ginkgo biloba for preventing cognitive decline in older adults: a randomized trial. JAMA. 2009;302(24):2663-70.
- Weinmann S, et al. Effects of Ginkgo biloba in dementia: systematic review and meta-analysis. BMC Geriatr. 2010;10:14.
- Laws KR, et al. Is Ginkgo biloba a cognitive enhancer in healthy individuals? A meta-analysis. Hum Psychopharmacol. 2012;27(6):527-33.
- Nicolai SP, et al. Ginkgo biloba for intermittent claudication. Cochrane Database Syst Rev. 2013;(6):CD006888.
- Hilton MP, et al. Ginkgo biloba for tinnitus. Cochrane Database Syst Rev. 2013;(3):CD003852.
- NIH National Center for Complementary and Integrative Health. Ginkgo Biloba.
- NIH Office of Dietary Supplements. Ginkgo Biloba Fact Sheet for Health Professionals.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.