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Memory Supplement GuideThe Memory Supplement Shelf: What Is On It And What Has Been Tested
Four families of product, and a fifth group that is not a supplement at all.
Botanicals, amino acids borrowed from sports nutrition, vitamins and minerals, and combination formulas. Then, separately, the things with randomised evidence for cognitive outcomes, none of which is sold in a bottle. Knowing which group a product belongs to answers most of the questions about it.
Written for somebody standing in front of the shelf with no particular brand in mind.
Family one: the botanicals
Ginkgo, bacopa, ginseng, lion's mane. The oldest part of this shelf and the part with the longest folk history, which is both its appeal and the reason it has been tested hardest.
Ginkgo is the instructive case. It is the most-sold single botanical in the category and it has been through a randomised trial of more than three thousand older adults at 120 mg twice a day. The trial found no reduction in the incidence of dementia. That is a real answer to a real question, and it is a better piece of information than anything a smaller positive study could have provided.
The lesson generalises. A botanical with a long history and no large negative trial is not better evidenced than ginkgo; it is less tested.
Family two: the amino acids, borrowed from sports nutrition
Arginine, citrulline, beta-alanine, taurine. These arrived on the memory shelf from the pre-workout shelf, and the route they travelled explains almost everything about their evidence base.
The mechanism is blood flow. Arginine becomes nitric oxide, nitric oxide relaxes vessels, and wider vessels carry more blood. Citrulline exists in the category because most oral arginine never reaches the circulation, and citrulline does. For the brain specifically there is one trial measuring cerebrovascular function, in athletes, during sprint intervals, at 8.8 g a day.
Beta-alanine follows the same pattern: a large sports evidence base (pooled effect size 0.18 for exercise capacity) and one small imaging trial pointing at the brain. The consistent feature of this family is that the amounts are grams, which is a problem for any capsule.
How many grams, and how many capsules would that be? The trials are public and the arithmetic is simple. A product claiming several of these at once, in one capsule, is claiming something the format does not permit.
Family three: the vitamins and minerals
The B vitamins, vitamin D, magnesium, zinc. Unfashionable, cheap, and holding the most encouraging trial results on the whole shelf.
COSMOS-Web gave older adults a daily multivitamin and found a small improvement in memory against placebo. COSMOS-Mind found a comparable signal on a different cognitive battery. Neither is a dramatic result and both are more than the botanical family has produced.
The catch is the same as always with a nutrient: it helps most where there was a shortfall. Niacin is a clear example. It becomes NAD, every cell needs NAD, and severe deficiency causes pellagra whose third symptom is dementia. But the cohort evidence is observational, the useful amounts are milligrams, and the supplemental ceiling is 35 mg a day.
One practical warning for this family. A survey of over-the-counter niacin preparations found the free nicotinic acid content varying widely between products sold side by side, which is a reminder that a named vitamin on a label is not the same as a measured amount in a capsule.
Family four: the combination formulas, and what nobody has tested
Most of this shelf. Six, eight or twelve named ingredients in one capsule, each with its own literature, and no trial of the combination anywhere.
That is not automatically a criticism. Testing a combination is expensive and the result applies only to that exact combination at that exact set of amounts, which is why almost nobody does it. What it means is that a combination product inherits its plausibility from its ingredients and cannot inherit their results.
The reasonable way to read one is ingredient by ingredient, at the amounts it prints, against the amounts the trials used. If it prints no amounts, that reading is not available, and the honest conclusion is that the product cannot be assessed rather than that it fails.
The fifth group: things sold as supplements that are not
The worst end of this category is not a weak formula. It is a product containing something that should not be in a supplement at all. An analysis of cognitive-enhancement products identified centrophenoxine — an unapproved drug — in items sold as dietary supplements.
A product that names its ingredients and declines to print the amounts is a different kind of problem from a product that conceals what is in it. Both are worth knowing about, and confusing the two makes the word meaningless for the cases that deserve it.
- A product naming a compound you cannot find in any food is worth looking up before swallowing.
- A product promising a result rather than support has already broken the rule it operates under.
- A product with no manufacturer, no lot code and no telephone number has no way to answer a question about itself.
What has randomised evidence, and comes in no bottle
| Intervention | Trial | What it found |
|---|---|---|
| Treating hearing loss | ACHIEVE | Slower cognitive decline over three years in the higher-risk participants |
| Controlling blood pressure | SPRINT MIND | Fewer cases of mild cognitive impairment under intensive treatment |
| Sleeping properly | The consolidation literature | Sleep is the mechanism by which a day’s memories are consolidated |
| A daily multivitamin | COSMOS-Web | Small memory improvement against placebo in older adults |
Three of these four cost nothing beyond an appointment, and the fourth is the cheapest product on the shelf.
If the people around you have noticed, that is an appointment rather than a purchase. Hearing, blood pressure, sleep, thyroid function and the side effects of existing medicines all produce this picture, and every one of them is checkable by somebody qualified to check it.
Sources behind this category guide
Fifteen references. Four of them describe interventions this desk does not sell.
- DeKosky ST, Williamson JD, Fitzpatrick AL, et al. Ginkgo biloba for prevention of dementia: a randomized controlled trial. JAMA. 2008;300(19):2253-62. PMID 19017911. https://pubmed.ncbi.nlm.nih.gov/19017911/
- Mariotti F, Petzke KJ, Bonnet D, et al. Kinetics of the utilization of dietary arginine for nitric oxide and urea synthesis: insight into the arginine-nitric oxide metabolic system in humans. Am J Clin Nutr. 2013;97(5):972-9. PMID 23535108. https://pubmed.ncbi.nlm.nih.gov/23535108/
- Li A, Li H, Chen J. The effects of L-citrulline supplementation on cerebrovascular function during sprint interval training in taekwondo athletes. J Exerc Sci Fit. 2025;23(3):222-228. PMID 40474881. https://pubmed.ncbi.nlm.nih.gov/40474881/
- Saunders B, Elliott-Sale K, Artioli GG, et al. β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis. Br J Sports Med. 2017;51(8):658-669. PMID 27797728. https://pubmed.ncbi.nlm.nih.gov/27797728/
- Ostfeld I, Zamir A, Ben-Zeev T, et al. β-Alanine supplementation improves fractional anisotropy scores in the hippocampus and amygdala in 60-80-year-old men and women. Exp Gerontol. 2024;194:112513. PMID 38971131. https://pubmed.ncbi.nlm.nih.gov/38971131/
- Yeung LK, Alschuler DM, Wall M, et al. Multivitamin Supplementation Improves Memory in Older Adults: A Randomized Clinical Trial. Am J Clin Nutr. 2023;118(1):273-282. PMID 37244291. https://pubmed.ncbi.nlm.nih.gov/37244291/
- Baker LD, Manson JE, Rapp SR, et al. Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial. Alzheimers Dement. 2023;19(4):1308-1319. PMID 36102337. https://pubmed.ncbi.nlm.nih.gov/36102337/
- Morris MC, Evans DA, Bienias JL, et al. Dietary niacin and the risk of incident Alzheimer's disease and of cognitive decline. J Neurol Neurosurg Psychiatry. 2004;75(8):1093-9. PMID 15258207. https://pubmed.ncbi.nlm.nih.gov/15258207/
- Minto C, Vecchio MG, Lamprecht M, et al. Definition of a tolerable upper intake level of niacin: a systematic review and meta-analysis of the dose-dependent effects of nicotinamide and nicotinic acid supplementation. Nutr Rev. 2017;75(6):471-490. PMID 28541582. https://pubmed.ncbi.nlm.nih.gov/28541582/
- Meyers CD, Carr MC, Park S, et al. Varying cost and free nicotinic acid content in over-the-counter niacin preparations for dyslipidemia. Ann Intern Med. 2003;139(12):996-1002. PMID 14678919. https://pubmed.ncbi.nlm.nih.gov/14678919/
- Cohen PA, Avula B, Khan I. The unapproved drug centrophenoxine (meclofenoxate) in cognitive enhancement dietary supplements. Clin Toxicol (Phila). 2022;60(10):1156-1158. PMID 35959800. https://pubmed.ncbi.nlm.nih.gov/35959800/
- Lin FR, Pike JR, Albert MS, et al. Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. Lancet. 2023;402(10404):786-797. PMID 37478886. https://pubmed.ncbi.nlm.nih.gov/37478886/
- SPRINT MIND Investigators for the SPRINT Research Group; Williamson JD, Pajewski NM, et al. Effect of Intensive vs Standard Blood Pressure Control on Probable Dementia: A Randomized Clinical Trial. JAMA. 2019;321(6):553-561. PMID 30688979. https://pubmed.ncbi.nlm.nih.gov/30688979/
- Yasser E, Ayache L, El Khayat H, et al. Sleep and memory consolidation: Neural and cognitive perspectives. Prog Brain Res. 2026;299:137-176. PMID 42547206. https://pubmed.ncbi.nlm.nih.gov/42547206/
- Memory. MedlinePlus, U.S. National Library of Medicine. https://medlineplus.gov/memory.html
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