The short version
- The Ginkgo Evaluation of Memory study followed 3,069 adults aged 72 to 96 on 120mg of ginkgo twice daily for a median of 6.1 years and found no difference from placebo in the annual rate of decline in memory, attention, language, visuospatial ability or executive function.
- A 2012 meta-analysis in healthy people put ginkgo's effect on memory at d = −0.04 across 1,132 participants, on executive function at d = −0.05 across 534, and on attention at d = −0.08 across 910 — all non-significant.
- A 2002 JAMA trial gave 230 healthy adults over 60 ginkgo 40mg three times daily for six weeks and found no significant difference from placebo on any test, on self-reported memory, or on ratings by the people they lived with.
- The 2010 Cochrane review of ginseng for cognition found nine placebo-controlled trials, could pool none of them, and concluded there is a lack of convincing evidence for a cognitive-enhancing effect in healthy participants.
- The strongest result for the ginkgo-ginseng combination is a single 2000 trial in 256 healthy middle-aged volunteers reporting a 7.5% average improvement on one memory index, which has not been replicated at that size.
Fifty years of trials. Three of them in JAMA. A Cochrane review. A meta-analysis pooling more than a thousand healthy people. For a botanical pair that sits in half the focus formulas on the market, ginkgo and ginseng have an unusually large evidence base — and that is exactly the problem, because when you read it end to end, most of it is flat.
We sell a ginkgo-and-ginseng capsule. Here is the record anyway.
The largest ginkgo trial ever run
The Ginkgo Evaluation of Memory study randomised 3,069 community-dwelling adults aged 72 to 96 across six US academic medical centres to 120mg of ginkgo extract twice daily or an identical-looking placebo, then followed them for a median of 6.1 years. Snitz and colleagues published the cognitive outcomes in JAMA in 2009.
Annual rates of decline did not differ between the ginkgo and placebo groups in any domain measured: memory, attention, visuospatial ability, language or executive function. Not a small effect that missed significance. No separation at all, across five domains, over six years, in three thousand people.
That is about as clean a null result as this field ever produces, and it is worth sitting with, because the trial was well funded, adequately powered, and ran longer than any supplement study you are likely to see quoted on a product page.
The short version, in healthy adults
Maybe six years is the wrong question and the real claim is a lift you notice in a few weeks. Solomon and colleagues tested exactly that in JAMA in 2002: 230 community-dwelling volunteers over 60, all in generally good health with Mini-Mental State scores above 26, randomised to ginkgo 40mg three times a day or matching placebo for six weeks — the manufacturer's own instructions.
There were no significant differences between groups on any outcome measure. Not on verbal or nonverbal learning and memory, not on attention and concentration, not on naming and verbal fluency, not on the participants' own memory questionnaire, and not on the global impression recorded by the spouses, friends and relatives who lived with them. The authors' conclusion is blunt: taken as directed, ginkgo provided no measurable benefit to adults with healthy cognitive function.
Pooling everything, in people who are fine
Laws and colleagues ran the meta-analysis in 2012, restricted to healthy individuals. Effect sizes were non-significant and close to zero across the board: memory d = −0.04 in 1,132 participants, executive function d = −0.05 in 534, attention d = −0.08 in 910. All three point marginally the wrong way. Meta-regression found effect size unrelated to participant age, trial duration, daily dose, total dose or sample size — so the usual escape hatches, that the dose was too low or the trial too short, do not survive contact with the data.
Ginseng, which is thinner than you would guess
The 2010 Cochrane review of ginseng for cognition found nine randomised, double-blind, placebo-controlled trials. Only five had extractable data, and pooling was impossible because outcome measures, trial durations and doses were all different. The reviewers reported that results suggested improvement in some aspects of cognitive function, behaviour and quality of life, then landed where the evidence forced them to land: there is a lack of convincing evidence for a cognitive-enhancing effect of Panax ginseng in healthy participants. They also found no serious adverse events, which matters and which we will come back to.
The best case for the combination, stated fairly
There is one substantial trial of the pair together, and we are not going to hide it because it is the friendliest result in this article. Wesnes and colleagues, in Psychopharmacology in 2000, ran a double-blind, placebo-controlled, 14-week, multi-centre trial in 256 healthy middle-aged volunteers using capsules of 60mg standardised ginkgo plus 100mg standardised ginseng, in two dosing regimens. The combination significantly improved an Index of Memory Quality — an average improvement of 7.5%, covering working and long-term memory, sustained across the 12-week dosing period and still present after a two-week washout.
Now the caveats, which are ours to give you. It is one trial, from 2000, on a composite index the researchers assembled from their own computerised battery; the lead author's affiliation was a cognitive testing company. Nothing since has replicated it at that size. And the meta-analytic work that came later was on ginkgo alone, so it neither confirms nor refutes the combination — it simply means the combination has never been put through the same wringer.
So why is this still on our shelf?
Because some people like it, it is cheap, and the Cochrane reviewers found no serious adverse events across the ginseng trials they assessed. That is a legitimate reason to stock something. It is not a reason to promise anything.
One practical caution regardless: if you take an anticoagulant or antiplatelet medicine, or you have surgery scheduled, ask a pharmacist before starting ginkgo. That is a thirty-second conversation and it is free.
What we'd actually tell you
If you are a healthy adult buying this expecting a step change in memory or concentration, the trial record says do not. We would rather lose the sale than have you spend six months waiting for something the literature says is not coming.
If you want to try it anyway — because a friend swears by it, because you like the ritual — go in with a defined test. Pick one thing you could actually notice, run it for eight weeks, and stop if nothing changes. That is not us being modest. It is what 3,069 people over six years earned the right to tell you.
Good questions
Does ginkgo biloba actually improve memory?
Not in healthy adults, on the evidence available. A 2012 meta-analysis of randomised trials found effect sizes near zero for memory, executive function and attention, and a six-year trial in 3,069 older adults found no difference from placebo in any cognitive domain. If someone tells you otherwise, ask which trial they are quoting.
How long does ginkgo take to work?
The trials have run everywhere from six weeks to six years and none of them found a benefit in healthy adults, so duration does not appear to be the missing ingredient. The 2012 meta-analysis specifically tested whether longer trials or higher doses produced bigger effects, and found they did not.
Is ginkgo safe to take every day?
We will only claim what we can cite. The Cochrane review of ginseng trials reported no serious adverse events across the studies it assessed, and we have not seen a safety signal reported in the large ginkgo trials. What we would actually raise: if you take a blood-thinning or antiplatelet medicine, or have surgery scheduled, ask a pharmacist before starting ginkgo.
Why do you still sell FOCUS+ if the evidence is this weak?
Because it is inexpensive, it appears to be well tolerated, and some customers want it. Those are honest reasons to stock something. They are not reasons to claim it sharpens your thinking, so we do not. If you would rather put the money elsewhere, that is the correct read of this article.
Is ginseng better than ginkgo for focus?
Neither has convincing human evidence in healthy people. Ginseng's dataset is smaller and messier than ginkgo's — nine trials, none poolable — which is a different problem from ginkgo's, where the trials are large and the answer is clearly no. Smaller evidence base is not the same as better odds.
What actually helps concentration if this doesn't?
Sleep, and ruling out a medical cause. Short sleep, low iron, thyroid problems, low mood and medication side effects all produce exactly the fuzzy, effortful thinking people buy nootropics for, and all of them are more fixable than a botanical is likely to be. A blood panel is a better first purchase than a capsule.
Sources
- Snitz BE, O'Meara ES, Carlson MC, et al. Ginkgo biloba for preventing cognitive decline in older adults: a randomized trial. JAMA, 2009. View study
- Solomon PR, Adams F, Silver A, Zimmer J, DeVeaux R. Ginkgo for memory enhancement: a randomized controlled trial. JAMA, 2002. View study
- Laws KR, Sweetnam H, Kondel TK. Is Ginkgo biloba a cognitive enhancer in healthy individuals? A meta-analysis. Hum Psychopharmacol, 2012. View study
- Geng J, Dong J, Ni H, et al. Ginseng for cognition. Cochrane Database Syst Rev, 2010. View study
- Wesnes KA, Ward T, McGinty A, Petrini O. The memory enhancing effects of a Ginkgo biloba/Panax ginseng combination in healthy middle-aged volunteers. Psychopharmacology (Berl), 2000. View study
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
