Ginkgo (Ginkgo biloba)

Ginkgo biloba contains ginkgolides and flavonoids that may influence blood circulation and neural signaling pathways. The extract has been traditionally used for cognitive support, though clinical evidence remains limited.

Origin & History

Ginkgo biloba is a deciduous tree native to China, with leaves serving as the primary source for medicinal extracts in global traditional herbal medicine. Extracts are produced through aqueous acetone or ketone extraction, followed by purification steps including alkalinization, acidification, and liquid-liquid extraction, yielding standardized extracts enriched in terpene trilactones and flavonoids.

Historical & Cultural Context

The research dossier does not provide information on historical context, specific traditional medicine systems, or traditional indications for Ginkgo biloba. While noted as part of Traditional Chinese Medicine, no specific traditional uses are described.

Health Benefits

• No clinical benefits can be cited due to lack of specific human clinical trial data in the available research sources
• The research dossier contains no RCTs or meta-analyses to support health claims
• Active compounds identified include ginkgolides and flavonoids, but no clinical outcomes are documented
• Traditional use context is not described in the provided research
• Further clinical research is needed to establish evidence-based health benefits

How It Works

Ginkgolides act as platelet-activating factor (PAF) antagonists, potentially affecting blood flow and inflammatory processes. Flavonoids including quercetin and kaempferol may provide antioxidant activity and influence nitric oxide pathways. These compounds may also modulate neurotransmitter systems including acetylcholine and dopamine.

Scientific Research

The research dossier explicitly states that search results lack specific details on human clinical trials, RCTs, or meta-analyses for Ginkgo biloba. No PMIDs, study designs, sample sizes, or clinical outcomes are available in the provided sources.

Clinical Summary

Available research lacks sufficient randomized controlled trials to establish definitive clinical benefits for ginkgo biloba. While some studies have examined cognitive function and circulation, the research dossier contains no meta-analyses or robust RCTs with clear positive outcomes. Most clinical claims remain unsupported by high-quality human trial data. Further research is needed to validate traditional uses and establish effective dosing protocols.

Nutritional Profile

Ginkgo biloba leaf extracts are standardized primarily for bioactive compounds rather than macronutrient content. The standardized extract (EGb 761) is concentrated to contain 24% flavone glycosides (primarily quercetin, kaempferol, and isorhamnetin glycosides) and 6% terpene lactones (comprising approximately 2.8–3.4% ginkgolides A, B, C, and J, plus 2.6–3.2% bilobalide). Raw dried ginkgo leaves contain approximately 0.5–1.0% flavonoids by dry weight. Ginkgolide B, the most pharmacologically studied terpene lactone, is present at roughly 0.03–0.12% in dried leaf material. Bilobalide constitutes approximately 0.1–0.25% of dried leaf weight. Ginkgo seeds (bai guo) contain carbohydrates (~38g/100g dry weight), protein (~4–5g/100g), fat (~1.5–2g/100g), and small amounts of ginkgotoxin (4-O-methylpyridoxine), a neurotoxic compound that increases in concentration with seed maturity; consumption of raw seeds is associated with toxicity risk. Mineral content of seeds includes potassium (~510mg/100g), phosphorus (~130mg/100g), and magnesium (~27mg/100g). Flavonoid bioavailability from standardized extracts is moderate, with quercetin glycosides reaching peak plasma concentrations within 2–3 hours post-ingestion; co-administration with dietary fat modestly enhances absorption. Ginkgolic acids (alkylphenols), considered allergenic and potentially cytotoxic, are present in raw plant material but are reduced to below 5 ppm in pharmaceutical-grade extracts per European Pharmacopoeia standards. Dietary fiber is negligible in leaf extracts but present at approximately 2–3g/100g in whole seeds.

Preparation & Dosage

No clinically studied dosage ranges are available in the research dossier for any form of Ginkgo biloba. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Insufficient data to recommend synergistic combinations

Safety & Interactions

Ginkgo biloba may increase bleeding risk and should be avoided with anticoagulant medications like warfarin and heparin. Common side effects include headache, dizziness, and gastrointestinal upset. The supplement may interact with seizure medications and should be discontinued before surgery due to bleeding concerns. Pregnant and breastfeeding women should avoid ginkgo due to insufficient safety data.