Memory and cognition: Evidence-Based Supplement Guide

No one in Avelor currently holds a supplement saved for memory, which makes this the guide written before anyone needs it rather than after. That is the right order, because this is the category where fear does the selling and the gap between what is marketed and what has been tested is widest. **The evidence that exists is about risk over decades, not about recall this afternoon.** The Lancet standing Commission on dementia prevention sets out modifiable risk factors across the life course and what acting on them is estimated to be worth (PMID 39096926, 32738937). That is the document worth reading, and none of it is a supplement. The tested version of acting on it is multidomain. A two-year randomised trial combined diet, exercise, cognitive training and vascular risk management in at-risk older adults (PMID 25771249). A recent randomised study compared structured against self-guided multidomain programmes (PMID 40720610), and a trial tested intensive lifestyle change in mild cognitive impairment (PMID 38849944). Among supplements, the readings are mixed and mostly conditional. A systematic review of ginkgo biloba reported that a standardised extract stabilised or slowed decline in cognition, function and behaviour in people with existing cognitive impairment or dementia (PMID 25114079). The effect was most apparent in those with neuropsychiatric symptoms. That is a finding in people who are already affected, not a preventive one, and a broader review of plant-derived nootropics reports inconsistency across the field (PMID 34978226). Omega-3's evidence is largely observational. A review of prospective cohorts associated higher intake and higher membrane DHA with lower risk of cognitive decline (PMID 37028557). Systematic reviews in Alzheimer's disease (PMID 38924283) and in middle-aged and older adults report possible benefit to executive function (PMID 38468309). B vitamins are conditional on status. One systematic review concluded that populations at risk should have adequate B vitamin status (PMID 34432056). A separate meta-analysis found B12 supplementation **likely ineffective** for cognitive function in people without advanced neurological disorders (PMID 33809274). The surprise in this category is creatine, and it is worth stating because it cuts against the guide's general scepticism. A systematic review and meta-analysis reported that creatine supplementation **enhanced measures of memory performance** in healthy individuals, with the effect most apparent in older adults (PMID 35984306). A further systematic review examined cognitive function more broadly while calling for work on populations and durations (PMID 39070254). It is also the only compound here that appears in three separate guides in this set on its own merits.

1. **Read the Commission's risk factors, not a supplement label** (PMID 39096926). Hearing, education, blood pressure, smoking, alcohol, physical activity, social contact and air pollution are the levers with evidence. 2. **Treat the multidomain trials as the tested version of that advice** (PMID 25771249, 40720610). 3. **Have hearing and blood pressure checked.** Both are on the Commission's list and both are ordinary appointments. 4. **If you are considering a supplement, creatine has the most surprising evidence** and omega-3 the most observational (PMID 35984306, 37028557). 5. **Do not take B12 for memory unless you are deficient** (PMID 33809274).

Where the research supports a timeframe, the multidomain trial ran for **two years** (PMID 25771249) and the Commission's risk factors operate over **decades** (PMID 39096926). The ginkgo review assessed outcomes at around **six months** in people already affected (PMID 25114079). The creatine memory trials are shorter still, and measure test performance rather than anything about dementia risk (PMID 35984306).

- **No supplement in this guide has been shown to lower anyone's risk of dementia.** The strongest evidence here is observational, or is about people already affected, and the guide does not let either stand in for what it would mean to reduce that risk. - **Ginkgo's positive result is in cognitive impairment and dementia**, not in healthy people worried about their memory (PMID 25114079). - **The omega-3 cohort evidence cannot separate the supplement from the people who take it** (PMID 37028557). Diet, income and health behaviour travel together. - **Creatine's memory result is about test scores in healthy adults** (PMID 35984306). It is a real and replicated-looking finding on a narrow outcome, and it is not a claim about dementia. - **B vitamin findings are about status, not about supplementing regardless** (PMID 34432056, 33809274). That distinction is the same one the energy and adhd guides turn on. - **A plant-derived nootropics review reports inconsistency as its headline** (PMID 34978226), which is the honest summary of most of this shelf.

- **New or worsening memory problems need assessment, not a supplement.** Some causes are treatable, including thyroid disease, B12 deficiency, depression, sleep apnoea and medication effects. That is a conversation with **a doctor**, and it is the single most useful thing in this guide. - **Ginkgo affects bleeding risk and interacts with medicines.** Anyone taking an anticoagulant or antiplatelet medicine, or facing surgery, should raise it with **a pharmacist or prescriber** before starting. - **Do not stop or change a prescribed medicine for memory or dementia on the strength of anything here** (PMID 33667416). That decision belongs to **the clinician who prescribes it**. - **Be careful with products sold on fear.** This category has the strongest emotional pull and the thinnest evidence, and a product promising to prevent dementia is making a claim nothing in this guide supports. - **Sudden confusion, sudden memory loss, or a change over days rather than months is an emergency rather than a supplement question.** Stroke, infection and medication reactions all present that way.

Resolves **and** has a catalogue key, so it can be interaction-checked: - `avelor:sup:creatine` - `avelor:sup:ginkgo-biloba` - `avelor:sup:omega-3`, `avelor:sup:omega-3-fish-oil` - `avelor:sup:cyanocobalamin`, `avelor:sup:methylcobalamin`, `avelor:sup:adenosylcobalamin` - `avelor:sup:folic-acid`, `avelor:sup:l-5-methylfolate` Resolves but has **no catalogue key**, so it displays as recognised and is checked against nothing: - `avelor:sup:hericium-erinaceus` (lion's mane) - `avelor:sup:omega-3-fatty-acids` No supplement entity: **phosphatidylserine** and **bacopa**. This is the best-covered guide of the twenty, and the reason is worth noting rather than celebrating. Everything with real evidence here happens to be a compound that already earned an entity for another reason. Creatine came from athletic performance, ginkgo from its interaction profile, omega-3 from cardiovascular work, and B12 and folate from deficiency. Nothing was added because of memory. So good coverage here is a side effect of other work, in the same way that the gaps in thyroid, hair, pregnancy and eye were side effects of nobody doing that work. Both are symptoms of the same thing: the entity list is not derived from anything, so its correlation with importance is accidental in both directions.

| PMID | Title | | --- | --- | | 39096926 | "Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission" | | 32738937 | "Dementia prevention, intervention, and care: 2020 report of the Lancet Commission" | | 25771249 | "A 2 year multidomain intervention of diet, exercise, cognitive training, and vascular risk monitoring versus control to prevent cognitive decline in at-risk elderly people (FINGER): a randomised controlled trial" | | 40720610 | "Structured vs Self-Guided Multidomain Lifestyle Interventions for Global Cognitive Function: The US POINTER Randomized Clinical Trial" | | 38849944 | "Effects of intensive lifestyle changes on the progression of mild cognitive impairment or early dementia due to Alzheimer's disease: a randomized, controlled clinical trial" | | 25114079 | "Efficacy and adverse effects of ginkgo biloba for cognitive impairment and dementia: a systematic review and meta-analysis" | | 34978226 | "Plant-derived nootropics and human cognition: A systematic review" | | 37028557 | "The Relationship of Omega-3 Fatty Acids with Dementia and Cognitive Decline: Evidence from Prospective Cohort Studies of Supplementation, Dietary Intake, and Blood Markers" | | 38924283 | "The effects of omega-3, DHA, EPA, Souvenaid® in Alzheimer's disease: A systematic review and meta-analysis" | | 38468309 | "The influence of n-3 polyunsaturated fatty acids on cognitive function in individuals without dementia: a systematic review and dose-response meta-analysis" | | 34432056 | "B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysis" | | 33809274 | "Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review, Meta-Analysis, and Meta-Regression" | | 35984306 | "Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials" | | 39070254 | "The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis" | | 33667416 | "Alzheimer's disease" |