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Ginkgo (Ginkgo biloba) — Maidenhair Tree, Fossil Tree
Materia Medica
Family: Ginkgoaceae
Common names: Ginkgo, maidenhair tree, fossil tree
Part used: Leaf (standardized extracts); seeds have a separate and more hazardous profile
Growth habit: Large deciduous tree
Primary tradition: Traditional Chinese medicine (seeds) and modern Western extract research (leaves)
Actions & Energetics
Neutral to slightly cooling. Traditional and modern actions for leaf extracts include circulatory support and cognitive tonic. The tree is ancient and long-lived. Energetically associated with longevity and resilience.
Botanical Description
An ancient deciduous tree with distinctive fan-shaped leaves that turn golden in autumn. Male and female trees are separate. The seeds are enclosed in a fleshy outer covering that becomes foul-smelling when ripe. The tree is widely planted as an ornamental.
Name Confusion & Look-Alikes
True ginkgo is botanically unique. The fan-shaped leaves are distinctive. Modern herbal products use standardized leaf extracts; these must not be confused with the seeds, which have a different and more hazardous safety profile.
Traditional Indications
Traditional Chinese use focuses primarily on the prepared seeds for respiratory and urinary conditions. Modern Western use centers on standardized leaf extracts for cognitive symptoms and peripheral circulation. The two uses are not interchangeable.
Preparations & Dosage
Clinical research generally involves standardized leaf extracts designed to control flavone glycosides, terpene lactones, and potentially harmful ginkgolic acids. Homemade leaf tea is not equivalent to those products. Seeds require specialized preparation and are not recommended for casual use.
Classical Formulations
Ginkgo seeds appear in traditional Chinese formulas. Modern standardized leaf extracts are a more recent development and do not have classical Ayurvedic or European formulations in the same sense.
Constituents
Flavone glycosides, terpene lactones (ginkgolides and bilobalide), and ginkgolic acids. Standardized extracts control these fractions. Ginkgotoxin in the seeds is responsible for the neurotoxic risk.
Modern Research
Standardized ginkgo leaf extracts have been studied for cognitive symptoms in dementia and for peripheral circulation. Findings are mixed and do not establish ginkgo as a cure or prevention for dementia. Results depend heavily on the specific extract used.
Adverse Effects
Raw or improperly prepared ginkgo seeds can be toxic. Ginkgotoxin can interfere with vitamin B6 metabolism and may provoke neurologic symptoms or seizures, especially with excessive intake. Leaf extracts are generally better tolerated but can cause mild gastrointestinal upset or headache in some people.
Interactions & Contraindications
Leaf extracts may increase bleeding tendency in some circumstances, making anticoagulant and antiplatelet medicines important discussion points. People with seizure disorders should use particular caution. Surgery timing should be discussed with a clinician. Do not confuse leaf products with seed use.
Pregnancy & Breastfeeding
Safety data for concentrated leaf extracts during pregnancy and breastfeeding are limited. Seeds should be avoided entirely.
Habitat & Cultivation
Native to China and widely planted as an ornamental tree worldwide. It is extremely long-lived and tolerant of urban conditions. Prefers full sun and well-drained soil.
Propagation
Propagated by seed or by cuttings and grafting for ornamental cultivars. Seed-grown trees take many years to reach maturity. Male trees are preferred for street planting because of the odor of female fruits.
Harvesting & Drying
Leaves are harvested in late summer or early autumn before they turn fully yellow. They are dried carefully for extract production. Seeds are collected when the outer flesh softens and require specialized processing if used at all.
Food Use
Ginkgo seeds are eaten in some Asian cuisines after specialized preparation to reduce toxicity. They are not a casual food. The leaves are not used as a culinary herb.
History, Folklore & Spiritual Use
Ginkgo is celebrated as a symbol of longevity and resilience, partly because the species has survived for an extraordinary evolutionary span. Individual trees have lived for centuries and are culturally significant in China and Japan.
Materia Medica Summary
Ginkgo (Ginkgo biloba) is a distinctive tree whose evidence base centers on standardized leaf extracts. Seeds and crude preparations require separate safety consideration. The fan-shaped leaves and extreme longevity of the tree are defining features. Educational information only.