Ginkgo Biloba for Enhanced Memory Formation

Ginkgo does not improve memory in healthy adults, despite decades of marketing to the contrary.

Overview

Ginkgo does not improve memory in healthy adults, despite decades of marketing to the contrary.

Verdict

Insufficient evidence

How It Works

Improved cerebral blood flow and platelet-activating factor inhibition are the proposed mechanisms, plausible in compromised circulation but not in healthy brains.

Dosing & Protocol

Typical dose

Recommended dose: Not established; trials in healthy adults used 120-240 mg/day of standardised extract and showed no memory benefit
Expected timeframe: Not established

Protocol

form: Not applicable
duration: Not applicable
co factor: Evidence is insufficient. This has been tested carefully and repeatedly in healthy adults: randomised trials of standardised ginkgo extract at 120-240 mg/day, including a well-conducted six-week trial in healthy volunteers and multiple meta-analyses, found no improvement in memory formation, learning or recall. The large GEM trial in over 3000 older adults found no effect on memory decline over six years. Whatever modest effect exists in established dementia does not extend to memory enhancement in people whose memory is normal.
titration: Not applicable
starting dose: Not applicable as an established treatment for memory enhancement

Evidence

What the studies say

Randomised trials in healthy volunteers, including a well-known JAMA trial, found no memory benefit over placebo. Positive findings are largely confined to populations with existing cerebrovascular or cognitive impairment.

Comparative effects of Bacopa monnieri and Ginkgo biloba on cognitive functions: A systematic review and network meta-analysis

Score: 7/10

2026

meta_analysis

n=2107

Tiemtad P, et al.

Brahmi, particularly in high-dose formulations, shows promise as a cognitive enhancer compared to Ginkgo in healthy adults.

View source

Ginkgo biloba extract EGb761 in dementia: a meta-analysis of randomised controlled trials

Score: 7/10

2015

meta_analysis

n=2561

Tan MS, Yu JT, Tan CC +3 more

EGb761 at 240 mg per day was able to stabilise or slow decline in cognition, function, behaviour and global change at 22-26 weeks in cognitive impairment and dementia.

View source

Safety

Caveats

What does support memory: sleep (consolidation happens during it), physical exercise, treating hearing loss, blood pressure control, and spaced retrieval practice. New or progressive memory problems need medical assessment for reversible causes such as B12 deficiency, thyroid disease, depression, sleep apnoea and medication effects. Safety: ginkgo has antiplatelet activity, with case reports of intracranial and post-surgical bleeding - avoid with warfarin, DOACs, aspirin, clopidogrel and NSAIDs, and stop at least two weeks before surgery or dental extraction. It may lower the seizure threshold, so avoid in epilepsy. It induces CYP2C19, reducing levels of omeprazole and some antiepileptics, and interacts with efavirenz. Avoid in pregnancy, breastfeeding and children. Use only standardised extracts with ginkgolic acid below 5 ppm; crude leaf products are allergenic.

Less likely to help if

Everyone with normal memory: the trials in this population are consistently negative.

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