What the NIH says about the evidence
- The NIH center for complementary health (NCCIH) says there is no conclusive evidence that ginkgo helps any health condition.
- In a large NIH-funded study, more than 3,000 people aged 75 and older took ginkgo or a dummy pill for about six years. The two groups developed dementia at the same rate.
- It is uncertain whether ginkgo affects memory or thinking in healthy people. NCCIH describes much of that research as low quality.
Safety
- Leaf extract is likely safe for most adults in moderate amounts. Side effects can include dizziness, stomach upset and headache.
- Ginkgo may raise the risk of bleeding in people who take blood thinners such as warfarin. It may interact with other medicines too.
- Raw or roasted ginkgo seeds can be poisonous.
Please note: this page is general information, not medical advice. Ask your doctor what is right for you, especially if you have a health condition or take medicine.
