Ginkgo Biloba

Supplements · Cognitive & Vitality Herbs · Supplement, Typed Supps

One of the most heavily studied herbs — with disappointing results.

Stage by stage

Intake (Extract capsule): Active compounds absorbed in the small intestine.
Small intestine (Absorbed): Active compounds are absorbed in the small intestine.
Bloodstream & brain (Supports blood flow): Thought to support blood flow and provide antioxidant effects.
Brain (Mixed evidence for memory): Evidence for meaningful memory benefits in healthy adults is mixed.

What the evidence supports

Preventing dementia or cognitive decline — insufficient evidence. Two large, long, well-conducted prevention trials found no reduction in dementia incidence. This is a well-tested negative rather than an open question.
Improving symptoms in existing dementia — limited evidence. Some trials report small improvements at standardised doses; the overall picture is inconsistent.
Improving memory in healthy adults — insufficient evidence. The main reason people buy it, and it does not hold up.
Improving walking distance in peripheral arterial disease — limited evidence. Modest effects in some trials, less than supervised exercise achieves.

Typical dose

120–240 mg daily of a standardised leaf extract, split into two or three doses. The large prevention trials used 120 mg twice daily.

Upper limit: No formal upper limit, but 240 mg daily is the ceiling used in the trials, and there is little reason to exceed a dose that has already been tested and found wanting

Timing

Split into two daily doses in most studied protocols.

Time to effect

Wks–mo: Any reported cognitive benefit in studies.

Medication interactions

Warfarin, DOACs, and antiplatelets: Case reports of serious bleeding, including intracranial. Avoid the combination. (high)
Anti-seizure medication: May lower the seizure threshold and reduce drug effectiveness. (high)
Surgery: Stop at least two weeks before any procedure. (high)

Common myth

“Ginkgo reliably improves memory.” In reality: Large trials in healthy older adults have generally not shown a meaningful memory benefit.