Short answer: A large randomised trial of more than 3,000 older adults found Ginkgo biloba ineffective at preventing dementia, and further analysis found it did not slow cognitive decline either.
Why disclosing this negative finding is unusual for the category
Rather than only citing favorable research, directly naming a large trial's negative result reflects a genuinely rare, honest editorial standard for this product category.
Why Ginkgo is still included despite this finding
Ginkgo Biloba and Vinpocetine are both associated in research with cerebral blood flow — worth understanding this is a narrower, circulation-specific rationale, not a dementia-prevention claim.
💡 Worth knowing: improved circulation has not been shown to translate into measurable memory gains in healthy adults.