Brain Health Supplements: What's Worth Taking (and What's Not)

Short answer: Most brain supplements lack good evidence. Omega-3 DHA and creatine have positive randomized trials, with modest effects, and citicoline has less. Magnesium L-threonate, Bacopa and lion’s mane rest on small or few trials. Ginkgo failed in large trials. Eat well first, buy third-party-tested products, and ask a doctor or pharmacist before starting.

A few supplements have positive randomized trials behind them, but the effects are modest. Taken together, the best-supported ones reach a “Moderate” grade on our scale; most others are “Preliminary” at best.

If you take one, the best candidates are omega-3 DHA (900 mg/day in the main trial) and creatine monohydrate (5 g/day in the best-known trial). Supplements can interact with medicines, so ask a doctor or pharmacist first, especially if you take prescription drugs, have kidney disease, or are pregnant or breastfeeding.

In the US, the 1994 Dietary Supplement Health and Education Act (DSHEA) lets supplements go on sale without FDA pre-approval. Makers do not have to prove a product works; they only have to avoid claiming it treats or cures a disease.

Brain supplements ranked by evidence

Best-supported: omega-3 DHA and creatine

Omega-3 DHA

DHA is the most abundant omega-3 fat in the brain and part of the membranes of nerve cells. EPA, the other main omega-3, works mainly through anti-inflammatory pathways.

In the MIDAS trial (Yurko-Mauro 2010), 485 healthy adults aged 55 and over with age-related memory decline took 900 mg/day of DHA or placebo for 24 weeks. The DHA group made fewer errors on a visuospatial learning and memory test, but working memory and executive function did not improve.

In the Framingham Study (Tan 2012), the 1,575 dementia-free adults with the lowest red blood cell DHA had smaller brain volumes and lower scores on some cognitive tests. This was a cross-sectional study, so it cannot show cause. A meta-analysis of 25 trials in adults without dementia (Alex 2020) found no effect on global cognition and a mild benefit for memory.

If you buy a product, choose fish oil or algae-derived DHA with IFOS or other third-party certification. Fish oil can increase bleeding risk with anticoagulant or antiplatelet drugs. Higher doses (above about 1 g/day) have been linked to a higher risk of atrial fibrillation in trials. Ask a doctor or pharmacist first if you take medication. More on omega-3 and brain health and choosing a fish oil.

Creatine monohydrate

Creatine acts as a quick-access energy buffer in neurons, and the brain uses a lot of energy. In a crossover trial in 45 young vegetarian adults (Rae 2003), 5 g/day of creatine for six weeks improved working memory (backward digit span) and reasoning (Raven’s matrices). Vegetarians start with lower creatine stores.

McMorris (2006, 2007) studied creatine during sleep deprivation, using a loading dose of 20 g/day for seven days. Benefits were limited to some tasks: random movement generation, choice reaction time and mood in 2006, and a central executive task at 36 hours in 2007. Memory recall did not improve.

A systematic review of six RCTs with 281 people (Avgerinos 2018) concluded that creatine may improve short-term memory and reasoning. Results for other areas conflicted, and young people showed no change. People with kidney disease should not take creatine without a doctor’s advice. See our full guide to creatine for brain function.

Citicoline (CDP-choline)

Citicoline is a natural compound the body uses to build phosphatidylcholine, a major part of nerve-cell membranes. It has been proposed to support production of acetylcholine, a memory-related messenger. Its evidence is thinner than for DHA or creatine.

A 2005 Cochrane review (Fioravanti 2005) included 14 mostly short trials in older people with conditions ranging from subjective memory complaints to vascular dementia. It found some evidence of benefit on memory and behavior, no evidence of benefit on attention, and called for longer studies. Citicoline was well tolerated in those trials.

Nakazaki (2021) randomized 100 healthy adults aged 50–85 with age-associated memory impairment to 500 mg/day of citicoline or placebo for 12 weeks. Episodic memory and a composite memory score, both secondary outcomes, improved more with citicoline. For a comparison with another choline supplement, see alpha-GPC vs citicoline.

Preliminary: magnesium threonate, Bacopa and lion’s mane

Magnesium L-threonate

Magnesium L-threonate (marketed as Magtein) was developed to cross the blood-brain barrier more effectively than other forms. In rats (Slutsky 2010), it increased brain magnesium and enhanced synaptic density and plasticity in the hippocampus.

Human data is limited. Liu (2016) ran a randomized, double-blind trial in 44 adults aged 50–70 with cognitive complaints. A composite cognitive score improved more with magnesium L-threonate than with placebo, mainly in executive function and working memory. The company developing the product funded the trial, and we found no independent replication. The trial used 1.5–2 g/day of the compound, about 108–144 mg of elemental magnesium.

Nearly half of the US population gets less magnesium from food than the Estimated Average Requirement. The upper limit for magnesium from supplements is 350 mg/day for adults, and people with kidney disease should not take magnesium supplements without a doctor’s advice. See our magnesium guide for forms and food sources.

Bacopa monnieri

Bacopa is an Ayurvedic herb traditionally used for memory, and unlike many herbs it has been tested in controlled trials. A meta-analysis (Kongkeaw 2014) included nine randomized trials (518 people) of at least 12 weeks. Only two measures could be pooled: Bacopa shortened Trail B times and choice reaction time, suggesting faster attention.

The most cited single trial (Stough 2001) found improvements in speed of visual information processing, learning rate and memory consolidation in healthy adults. They took a standardized extract (Keenmind), reported as 300 mg/day, for 12 weeks.

Effects take time: most positive trials lasted at least 8–12 weeks. Bacopa can cause nausea or cramping in some users, especially on an empty stomach. It can also interact with medicines, so ask a doctor or pharmacist first if you take medication.

Lion’s mane

Compounds from lion’s mane mushroom stimulate nerve growth factor (NGF), a protein neurons need to grow and survive, in lab studies. That evidence comes from cell and animal studies of hericenones and erinacines.

In the most cited trial (Mori 2009), 30 older Japanese adults with mild cognitive impairment took lion’s mane or placebo for 16 weeks. The dose was four 250 mg tablets of dried mushroom powder three times daily, about 3 g/day. The lion’s mane group improved significantly more on a dementia screening scale (the Revised Hasegawa Dementia Scale) at weeks 8, 12 and 16. Scores fell back toward baseline four weeks after stopping.

Trials are small and have not been replicated independently in Western populations. Products on the market vary widely and are not equivalent to what was tested.

Weak or overhyped: ginkgo and multi-ingredient “brain pills”

Ginkgo biloba

Ginkgo is one of the most widely sold brain supplements, but the largest trials were negative. In the GEM study (DeKosky 2008), 3,069 adults aged 75 and over took 120 mg of ginkgo extract twice a day or placebo for a median of 6.1 years. Ginkgo did not reduce dementia or Alzheimer’s disease. A later analysis of the same trial (Snitz 2009) found no effect on cognitive decline.

The French GuidAge study (Vellas 2012) followed 2,854 adults aged 70 and over with memory complaints for 5 years and also found no reduction in Alzheimer’s disease. Smaller, shorter studies have occasionally reported modest benefits on specific tests, but the large trials did not confirm them. Ginkgo may also increase bleeding risk, especially with anticoagulant or antiplatelet drugs.

Proprietary blends and nootropic stacks

Products that pack a dozen ingredients into one capsule share the same problems. Proprietary blends hide individual doses, so you cannot tell whether any ingredient is present at an effective amount, and most are underdosed to fit. Many include ingredients such as DMAE, huperzine A or vinpocetine that lack rigorous human trials. A rule of thumb: with more than five or six active ingredients, each one is almost certainly below the doses tested.

Ginseng and phosphatidylserine have some research, but it is inconsistent. The FDA has called the phosphatidylserine evidence limited and inconclusive. Ginseng may have modest short-term effects on how energetic people feel, but its effects on objective cognitive tests have been unreliable.

How to choose a quality supplement

A good compound can still be a poor product if it is contaminated, underdosed or oxidized. Choose products verified by an independent tester:

• USP (United States Pharmacopeia): Checks identity, potency, purity and manufacturing quality.
• NSF International: Tests contaminants and label accuracy. NSF Certified for Sport also screens for banned substances.
• IFOS (International Fish Oil Standards): Fish oil only. Tests EPA/DHA content, oxidation and heavy metals.
• ConsumerLab.com: A subscription service that publishes test results for hundreds of products.

Some supplements do not contain what the label says. In 2015, the New York Attorney General’s office reported DNA tests suggesting that about four in five herbal supplements from major retailers did not contain the listed plant. The method was criticized, because processed extracts often lack intact DNA.

Herbal products, including Bacopa and ginkgo, can carry arsenic, lead, mercury or cadmium above safe thresholds. USP and NSF certification includes testing for these. Fish oil can oxidize during manufacture, storage or shipping. The health effects are unclear, but rancid oil signals poor quality and usually smells bad.

Who actually needs supplements

Nutrients from whole foods are generally preferable, because food brings cofactors, fiber and other compounds that affect absorption. Say you eat fatty fish twice a week, plenty of vegetables, nuts, seeds and whole grains, and have no diagnosed deficiency. Then your brain’s omega-3, B-vitamin, magnesium and choline needs can plausibly be met from food.

Supplements can fill a gap in these cases:

• Vegetarians and vegans: Plant-based diets are associated with lower DHA, creatine, choline and vitamin B12. Creatine and algae-derived DHA are the most justified here.
• Older adults: Absorption of B12 and magnesium falls with age, and people often eat less. Older adults are also more likely to take medicines that interact with supplements, so any supplement is best discussed with a doctor or pharmacist.
• People with a diagnosed deficiency: If bloodwork shows low magnesium, B12 or vitamin D, your doctor can advise on treating it.
• People under heavy demand: Some creatine studies were done in sleep-deprived people, with benefits on some tasks only.

Aim for the one to three products that address a real gap, not a long stack. We know of no well-documented harmful interactions among omega-3, creatine, citicoline, magnesium L-threonate, Bacopa and lion’s mane, but combinations have rarely been studied. If you take blood thinners, blood pressure drugs or psychiatric medications, talk to your doctor before adding supplements.

Red flags in brain supplement marketing

• “Clinically proven” with no citations: Treat it as marketing copy.
• Testimonials instead of data: The placebo effect on self-rated thinking is large.
• Hidden doses: A “proprietary blend” label means you cannot check what you are getting.
• Fast results: Omega-3, creatine, Bacopa and citicoline take weeks to months to show measurable effects. A product that works within days is probably relying on stimulants (often undisclosed caffeine) or placebo.
• Fear and authority: Lines like “your brain is shrinking every day” exaggerate real age-related change. “Doctor-formulated” labels and celebrity endorsements say nothing about whether a product works.

Frequently Asked Questions

What is the single best brain supplement?

If forced to choose one, omega-3 DHA has the broadest evidence, although a meta-analysis found only a mild benefit for memory and none for global cognition (Alex 2020). For vegetarians and vegans, creatine monohydrate may matter as much or more, because plant-based diets contain almost no creatine.

Do racetams or modafinil count as supplements?

No. Racetams (piracetam, aniracetam and others) are synthetic drugs, prescription-only in many countries and sold on gray markets elsewhere. Modafinil is a prescription medication for narcolepsy and shift work sleep disorder. Their risks and benefits are different, and this page covers only products legally sold as dietary supplements.

Can I just take a multivitamin for brain health?

A multivitamin may correct marginal shortfalls in B vitamins, zinc or vitamin D, which can indirectly support thinking. It contains no DHA, creatine or citicoline, so it is reasonable insurance but not a brain health strategy.

How do I know if a supplement is working?

Self-ratings are unreliable. Pick one outcome you care about, such as focus at work or remembering names. Take the supplement consistently for at least 8–12 weeks, then judge honestly, ideally with a standardized test. Improvements in the first few days are almost certainly placebo.

Sources

• Yurko-Mauro, K., McCarthy, D., Rom, D., Nelson, E. B., Ryan, A. S., Blackwell, A., Salem, N., Jr., & Stedman, M. (2010). Beneficial effects of docosahexaenoic acid on cognition in age-related cognitive decline. Alzheimer’s & Dementia, 6(6), 456–464. doi:10.1016/j.jalz.2010.01.013

• Tan, Z. S., Harris, W. S., Beiser, A. S., Au, R., Himali, J. J., Debette, S., … & Seshadri, S. (2012). Red blood cell omega-3 fatty acid levels and markers of accelerated brain aging. Neurology, 78(9), 658–664. doi:10.1212/WNL.0b013e318249f6a9

• Rae, C., Digney, A. L., McEwan, S. R., & Bates, T. C. (2003). Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proceedings of the Royal Society of London. Series B: Biological Sciences, 270(1529), 2147–2150. doi:10.1098/rspb.2003.2492

• Avgerinos, K. I., Spyrou, N., Bougioukas, K. I., & Kapogiannis, D. (2018). Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials. Experimental Gerontology, 108, 166–173. doi:10.1016/j.exger.2018.04.013

• McMorris, T., Harris, R. C., Swain, J., Corbett, J., Collard, K., Dyson, R. J., Dye, L., Hodgson, C., & Draper, N. (2006). Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol. Psychopharmacology, 185(1), 93–103. doi:10.1007/s00213-005-0269-z

• McMorris, T., Harris, R. C., Howard, A. N., Langridge, G., Hall, B., Corbett, J., Dicks, M., & Hodgson, C. (2007). Creatine supplementation, sleep deprivation, cortisol, melatonin and behavior. Physiology & Behavior, 90(1), 21–28. doi:10.1016/j.physbeh.2006.08.024

• Fioravanti, M., & Yanagi, M. (2005). Cytidinediphosphocholine (CDP-choline) for cognitive and behavioural disturbances associated with chronic cerebral disorders in the elderly. Cochrane Database of Systematic Reviews, (2), CD000269. doi:10.1002/14651858.CD000269.pub3

• Nakazaki, E., Mah, E., Sanoshy, K., Citrolo, D., & Watanabe, F. (2021). Citicoline and memory function in healthy older adults: A randomized, double-blind, placebo-controlled clinical trial. Journal of Nutrition, 151(8), 2153–2160. doi:10.1093/jn/nxab119

• Slutsky, I., Abumaria, N., Wu, L. J., Huang, C., Zhang, L., Li, B., … & Liu, G. (2010). Enhancement of learning and memory by elevating brain magnesium. Neuron, 65(2), 165–177. doi:10.1016/j.neuron.2009.12.026

• Liu, G., Weinger, J. G., Lu, Z. L., Xue, F., & Sadeghpour, S. (2016). Efficacy and safety of MMFS-01, a synapse density enhancer, for treating cognitive impairment in older adults: A randomized, double-blind, placebo-controlled trial. Journal of Alzheimer’s Disease, 49(4), 971–990. doi:10.3233/JAD-150538

• Kongkeaw, C., Dilokthornsakul, P., Thanarangsarit, P., Limpeanchob, N., & Scholfield, C. N. (2014). Meta-analysis of randomized controlled trials on cognitive effects of Bacopa monnieri extract. Journal of Ethnopharmacology, 151(1), 528–535. doi:10.1016/j.jep.2013.11.008

• Stough, C., Lloyd, J., Clarke, J., Downey, L. A., Hutchison, C. W., Rodgers, T., & Nathan, P. J. (2001). The chronic effects of an extract of Bacopa monniera (Brahmi) on cognitive function in healthy human subjects. Psychopharmacology, 156(4), 481–484. doi:10.1007/s002130100815

• Mori, K., Inatomi, S., Ouchi, K., Azumi, Y., & Tuchida, T. (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: A double-blind placebo-controlled clinical trial. Phytotherapy Research, 23(3), 367–372. doi:10.1002/ptr.2634

• DeKosky, S. T., Williamson, J. D., Fitzpatrick, A. L., Kronmal, R. A., Ives, D. G., Saxton, J. A., … & Furberg, C. D. (2008). Ginkgo biloba for prevention of dementia: A randomized controlled trial. JAMA, 300(19), 2253–2262. doi:10.1001/jama.2008.683

• Snitz, B. E., O’Meara, E. S., Carlson, M. C., Arnold, A. M., Ives, D. G., Rapp, S. R., … & DeKosky, S. T. (2009). Ginkgo biloba for preventing cognitive decline in older adults: a randomized trial. JAMA, 302(24), 2663–2670. doi:10.1001/jama.2009.1913

• Vellas, B., Coley, N., Ousset, P. J., Berrut, G., Dartigues, J. F., Dubois, B., … & Andrieu, S. (2012). Long-term use of standardised ginkgo biloba extract for the prevention of Alzheimer’s disease (GuidAge): A randomised placebo-controlled trial. The Lancet Neurology, 11(10), 851–859. doi:10.1016/S1474-4422(12)70206-5

• Alex, A., Abbott, K. A., McEvoy, M., Schofield, P. W., & Garg, M. L. (2020). Long-chain omega-3 polyunsaturated fatty acids and cognitive decline in non-demented adults: A systematic review and meta-analysis. Nutrition Reviews, 78(7), 563–578. doi:10.1093/nutrit/nuz073