Ginkgo: what the evidence actually shows

declining ginkgo — memory claims faded after null prevention trials

Reviewed by Substrate editorial, Independent research collective · 2026-07-16

⚠ Safety in context

seriouswith Warfarin: Ginkgo has antiplatelet activity; with warfarin it may increase bleeding risk.
moderatewith SSRI: Possible additive bleeding/serotonergic effects with SSRIs.

Evidence by outcome

inflammationgrade Bmoderate certainty— Systematic review and meta-analysis of 17 RCTs (1104 participants): Ginkgo biloba leaf extract significantly reduced serum CRP, IL-6, and TNF-alpha versus placebo. Effect on CRP was strongest at higher baseline inflammation (CRP ≥3 mg/L) and lower doses (<500 mg/day). One of the more consistent anti-inflammatory signals in this dataset.

cognitiongrade Clow certainty— no reliable benefit for preventing cognitive decline in large trials

moodgrade Clow certainty— Systematic review and network meta-analysis of herbal anxiolytics: Ginkgo biloba showed a modest anxiety-reducing signal among the herbs assessed, but the evidence base is heterogeneous and of limited certainty.

blood sugargrade Clow certainty— Meta-analysis: Ginkgo biloba extract significantly reduced fasting blood glucose and improved insulin resistance (HOMA-IR) versus control, plus reduced BMI and waist circumference, but did NOT significantly change HbA1c or fasting insulin levels — a partial biomarker signal, not comprehensive glycemic control.

joint healthgrade Dvery-low certainty— Narrative review: Ginkgo biloba extract (EGb 761) has demonstrated anti-inflammatory, antioxidant, and chondroprotective properties in experimental and preliminary clinical research for knee osteoarthritis, but this is a synthesis of mechanistic and early findings, not a meta-analysis of controlled trial outcomes. Too preliminary for a confident effect estimate.

People say · Evidence shows

“Ginkgo prevents dementia and boosts memory”

aheadlargemarketing claim

What it probably doesn't do

Ginkgo for joint health — Grade D, Narrative review: Ginkgo biloba extract (EGb 761) has demonstrated anti-inflammatory, antioxidant, and chondroprotective properties in experimental and preliminary clinical research for knee osteoarthritis, but this is a synthesis of mechanistic and early findings, not a meta-analysis of controlled trial outcomes. Too preliminary for a confident effect estimate..

Grade history

2026-07-16C → CCorrection by Claude (gold-standard provenance sweep): live Postgres source drift replaced with the verified seed source set [pmid-26058281] details →
2026-01-15B → CA large dementia-prevention trial reported a null result. details →

Re-review cadence: every 12 months (Grade A/B) · next scheduled by 2027-07-16 · methodology v1.

By outcome — the money pages

Compare

sources: PMID:35781715 · PMID:26058281 · PMID:35378276 · PMID:42157337 · PMID:41425500

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Reuse under CC-BY 4.0 with attribution to evidencebased.info.

Plain-text citation

Substrate. Ginkgo: what the evidence actually shows. https://evidencebased.info/interventions/ginkgo. Updated 2026-07-16.

BibTeX

@misc{substrate_ointerventionsginkgo,
  author = {Substrate editorial},
  title  = {Ginkgo: what the evidence actually shows},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/ginkgo},
  note   = {evidencebased.info}
}