Ginkgo biloba

What is Ginkgo biloba?

Ginkgo biloba is a herbal supplement derived from the leaves of the ancient Ginkgo tree, one of the oldest living tree species on Earth. This natural product belongs to the class of cognitive enhancement and circulatory support supplements, and is commonly used for memory problems, circulation issues, and various age-related cognitive concerns. Ginkgo biloba extract has been used in traditional medicine for centuries and remains one of the most widely studied herbal supplements today.

Uses

Ginkgo biloba is commonly used for several health conditions, though evidence varies for each application:

• Memory and cognitive function: Often taken to support memory, concentration, and mental clarity, particularly in older adults experiencing age-related cognitive decline
• Circulation problems: Used to improve blood flow to extremities and address symptoms of poor circulation, such as cold hands and feet
• Tinnitus: Sometimes recommended for ringing in the ears, though results are mixed
• Intermittent claudication: May help reduce leg pain caused by poor circulation during walking
• Vertigo and dizziness: Used to address balance problems and dizzy spells, particularly those related to circulation

How it works

Ginkgo biloba contains active compounds called flavonoids and terpenoids that are believed to improve blood circulation by dilating blood vessels and reducing blood viscosity. These compounds may also have antioxidant properties that help protect cells from damage caused by free radicals. The improved blood flow, particularly to the brain, is thought to be responsible for many of its potential cognitive benefits.

Side effects

Common side effects include:

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• Headache
• Dizziness
• Upset stomach or nausea
• Diarrhea
• Skin rash or allergic reactions
• Restlessness or agitation
• Sleep disturbances
• Mouth irritation

Serious side effects to watch for:

• Unusual bleeding or bruising
• Severe allergic reactions with difficulty breathing
• Seizures (rare but reported)
• Severe gastrointestinal bleeding
• Changes in heart rhythm

Warnings and precautions

• Bleeding disorders: People with bleeding disorders or those scheduled for surgery should avoid ginkgo, as it may increase bleeding risk
• Epilepsy: Individuals with seizure disorders should use caution, as ginkgo may lower the seizure threshold
• Pregnancy and breastfeeding: Safety has not been established during pregnancy or breastfeeding; generally not recommended
• Diabetes: May affect blood sugar levels, requiring closer monitoring in diabetic patients
• Allergies: People allergic to poison ivy, poison oak, or mango may be more likely to have allergic reactions to ginkgo

Interactions

Ginkgo biloba can interact with several medications and should be used cautiously with:

• Warfarin and other blood thinners: Increased risk of bleeding due to additive anticoagulant effects
• Aspirin and NSAIDs: May enhance bleeding risk when combined with these pain relievers
• Antiepileptic drugs: May reduce the effectiveness of seizure medications
• Diabetes medications: Can affect blood sugar control and may require dosage adjustments
• Antidepressants (MAOIs): May increase side effects when combined with certain antidepressants
• Omeprazole: May alter the metabolism of this proton pump inhibitor
• Thiazide diuretics: May increase blood pressure when used together
• Trazodone: May increase sedation and other side effects

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Evidence summary

The scientific evidence for ginkgo biloba’s effectiveness varies significantly by condition. There is moderate evidence supporting its use for intermittent claudication and some circulation problems. However, evidence for cognitive enhancement in healthy individuals or treating dementia shows limited evidence of benefit, with many high-quality studies showing minimal improvement over placebo. For tinnitus and vertigo, there is insufficient evidence to support routine use. Most recent large-scale studies have failed to demonstrate significant cognitive benefits in preventing dementia or improving memory in healthy older adults. For complete safety profiles and detailed research summaries, visit supplement.ge.

Dosage

Typical adult dosages range from 120-240 mg of standardized ginkgo biloba extract daily, usually divided into two or three doses. Most studies have used standardized extracts containing 24% flavone glycosides and 6% terpene lactones. Some formulations may recommend 40-80 mg taken three times daily. The supplement is typically taken with meals to reduce gastrointestinal side effects. However, appropriate dosage should always be determined by a healthcare provider based on individual health status and intended use, as optimal dosing may vary depending on the specific condition being treated.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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