This site lists five specific bullet points under "Not for you if" — worth reading each one individually alongside the separate "sensible fit" list.
What the five points actually are
Why the first two points are the most medically significant
- Have diagnosed dementia, Alzheimer's or another cognitive condition and want a treatment — this is not one; see a doctor
- Take blood-thinning medication without doctor sign-off — Ginkgo has real interaction potential
- Are scheduled for surgery soon — Ginkgo is a specific pre-surgical caution
- Are under 18, pregnant or nursing
- Expect dramatic memory changes within days
💊 Medical note: Ginkgo Biloba has documented interaction potential with blood-thinning medication and may increase bleeding risk. Talk to your doctor before starting if you take blood thinners, are scheduled for surgery, are pregnant, nursing, or under 18.