Ginkgo biloba. One of the oldest tree species on earth. Supplements use an extract of the fan-shaped leaves, usually standardized to flavonoids and terpene lactones.
What the research supports
The GEM study, which followed 3,069 adults aged 75 and older for about six years, found that ginkgo did not prevent dementia or slow cognitive decline. A Cochrane review found the evidence for benefit in existing dementia inconsistent and unreliable.
The dose that was actually studied
120 mg of standardized leaf extract (EGb 761) twice a day in the major trials.
What to look for on a label
- Leaf extract only, never seed
- Standardization to about 24 percent flavonoids and 6 percent terpene lactones for capsules
Who should not take it
- Anyone on blood thinners, antiplatelet drugs or regular aspirin
- Anyone with surgery or dental work coming up; stop two weeks before
- Pregnant or breastfeeding women
Read the full guide: Ginkgo Biloba for Memory: What the Biggest Trials Found.
This profile is for general education and is not medical advice. Talk to your doctor or pharmacist before starting a supplement, especially if you take medication or have a health condition.
