Quick Summary

Ginkgo biloba is a widely studied herbal supplement with potential neuroprotective, cognitive-enhancing, antioxidant, anti-inflammatory, and vascular benefits. It is commonly used in traditional medicine and investigated for conditions such as cognitive impairment, dementia, tinnitus, ischemic stroke, vascular cognitive impairment, and cardiovascular/metabolic health. Clinical evidence shows mixed results with some modest benefits on cognition and functional outcomes, while safety profiles are generally favorable though drug interaction risks exist.

What is it?

Ginkgo, scientifically known as Ginkgo biloba, is a tree native to China with a long history of use in traditional medicine. Extracts from the leaves are commonly used as herbal supplements believed to support brain function and vascular health.

Traditional Uses

Traditionally, Ginkgo biloba has been used for improving memory and cognitive functions, enhancing circulation, and as a remedy for respiratory ailments and circulatory disorders. It remains popular in traditional Chinese medicine and other herbal practices for these purposes.

Active Compounds

The primary active compounds in Ginkgo biloba extracts include flavonoids and terpenoids (such as ginkgolides and bilobalide), which are thought to contribute to its antioxidant, anti-inflammatory, and neuroprotective activities.

Potential Benefits with Evidence Levels

  • Cognitive impairment and dementia (Moderate to low certainty): Systematic reviews and meta-analyses suggest Ginkgo biloba may provide small to moderate improvements in cognition, global clinical status, and activities of daily living in dementia patients. Evidence for benefits in mild cognitive impairment (MCI) is less certain and likely minimal. Some randomized controlled trials indicate cognitive and functional benefits in vascular cognitive impairment and dementia post-cerebral infarction, particularly with the standardized extract EGb 761.
  • Post-stroke cognitive impairment (PSCI) and vascular cognitive impairment (VCI) (Limited and emerging): Network meta-analyses show that Ginkgo biloba extracts may improve Montreal Cognitive Assessment (MoCA) scores and global cognition measures. Evidence is limited due to small trial numbers and heterogeneous study designs.
  • Cognitive function in healthy adults (Preliminary, low to moderate): Some trials suggest possible improvements in memory with Ginkgo biloba, though effects on other cognitive domains such as attention and processing speed are inconsistent. Comparisons indicate other nootropics like Bacopa monnieri may offer superior benefits.
  • Tinnitus (Inconclusive): Controlled trials show that Ginkgo biloba extract EGb 761 may improve tinnitus severity for some patients, particularly those with coexisting anxiety or stress; however, overall randomized controlled trial (RCT) results are inconsistent with frequent placebo effects.
  • Ischemic stroke and neurological function (Limited but suggestive): Meta-analyses indicate that Ginkgo terpene lactone preparations combined with antiplatelet drugs may improve clinical outcomes post-ischemic stroke without increasing adverse events, although detailed safety and long-term efficacy data are lacking.
  • Cardiovascular and metabolic health (Limited): Some studies report improvements in heart failure classification (NYHA) and antioxidant/anti-inflammatory effects that may benefit vascular health. However, clinical trials show heterogeneity and higher-quality research is needed.
  • Other neurological disorders (Preclinical and limited clinical): Preliminary evidence suggests potential neuroprotective properties in neurodegenerative diseases such as Parkinson’s disease, primarily based on preclinical data and a small number of clinical studies.

Side Effects

  • Mild gastrointestinal symptoms
  • Potential increased bleeding risk, especially when combined with anticoagulants or antiplatelet agents
  • No conclusive evidence of severe adverse effects in controlled clinical trials

Drug Interactions

  • Antiplatelet and anticoagulant drugs (e.g., aspirin, clopidogrel, warfarin): Increased bleeding risk and abnormal coagulation parameters observed
  • Nonsteroidal anti-inflammatory drugs (NSAIDs): Potential elevated bleeding risk
  • Other drugs (e.g., omeprazole): Mild severity interactions noted

Who Should Avoid It

Due to the increased bleeding risk, Ginkgo biloba should be used with caution or avoided by individuals with bleeding disorders, those scheduled for surgery, or people taking blood-thinning medications unless under healthcare supervision. Specific contraindications are not well-defined in current clinical literature. Additionally, pregnant and breastfeeding women should only use Ginkgo biloba under qualified medical advice due to insufficient safety data.

Evidence Limitations

  • Many clinical trials have methodological limitations such as small sample sizes, short duration, heterogeneous preparations and dosages, and varied outcome measures
  • Evidence quality ranges from low to moderate, with some findings based on sparse data or single studies
  • High-quality, large-scale randomized controlled trials using standardized formulations are needed to confirm efficacy and safety
  • Heterogeneity among studies complicates meta-analyses and generalizability
  • Limited data exist on long-term safety, especially in vulnerable populations such as pregnant or breastfeeding women
  • Potential publication bias and placebo effects are noted in symptomatic conditions like tinnitus

References

Last Reviewed

June 2024

Disclaimer: This page is for informational purposes only and does not constitute medical advice. Before using Ginkgo biloba or any other supplement, please consult a qualified healthcare professional, especially if you have underlying health conditions or are taking medications.