Ranked by evidence within the category
Brain and cognition supplements: what the evidence says
This category covers 53 supplements for memory, focus, migraine and nerve health: 15 are rated moderate, 38 limited and none strong. Among the moderate items, bacopa has a replicated but small effect on attention and recall after about 12 weeks, caffeine with L-theanine gives a small attention boost, and riboflavin and butterbur have evidence for preventing migraine, with butterbur carrying a liver-safety problem. Several others work only in specific settings, such as L-tyrosine under acute stress, while popular nootropics such as lion's mane, ginkgo biloba, phosphatidylserine and magnesium L-threonate are in the limited tier.
Evidence last reviewed: September 2026
Moderate evidence (15)
High-dose riboflavin (400 mg/day) has reasonable evidence for reducing migraine frequency in adults, which is the one use worth considering.
Choline is an essential nutrient most people under-consume, with genuine importance for liver health and fetal brain development.
Acetyl-L-carnitine has the best evidence for painful diabetic neuropathy and depressive symptoms, where several trials show real benefit; its reputation as a general nootropic for healthy brains rests on much thinner ground.
Tyrosine reliably protects cognitive performance when the brain is depleted by acute stress such as cold, noise, or sleep loss, but it does essentially nothing for cognition in rested, unstressed people.
One of the few herbal nootropics with a replicated signal: about 12 weeks of standardized extract modestly speeds attention and improves delayed recall in healthy adults.
A choline compound with genuine clinical data in age-related cognitive decline, mostly as an add-on to dementia drugs.
The best-evidenced choline donor for memory, with a positive RCT in healthy older adults and supportive dementia meta-analysis data.
Mucuna is natural levodopa, and it behaves like the drug: two controlled trials in Parkinson's disease show comparable motor benefit to standard levodopa with faster onset.
Butterbur root extract at 75 mg twice daily cut migraine frequency by 48% versus 26% for placebo in a well-designed 245-patient trial, making it one of the better-evidenced herbal preventives.
Sage extract has a genuine cholinergic mechanism and several small human trials showing acute improvements in attention and memory, plus one positive four-month trial in Alzheimer's disease that was never replicated.
An amino acid that modulates NMDA receptor signalling, studied as an add-on to antipsychotics in schizophrenia.
Blends of riboflavin, magnesium, CoQ10 and herbs for migraine prevention.
B vitamins plus alpha-lipoic acid marketed for neuropathy.
A seven-herb Japanese Kampo formula used in dementia care for agitation, delusions and hallucinations.
The most studied nootropic stack: caffeine supplies the alertness and theanine takes some of the edge off.
Limited evidence (38)
A patented magnesium form marketed for memory and "brain magnesium" on the strength of rodent data and two small manufacturer-linked human trials.
The encouraging memory trials used bovine-cortex phosphatidylserine, which was pulled from the market over BSE concerns.
A Cochrane review settled the memory question decades ago: lecithin does not help dementia or age-related memory loss.
Agmatine has an interesting pharmacology — NMDA antagonism, nitric oxide modulation, imidazoline receptor activity — and a genuinely encouraging small trial in nerve-related back pain.
The largest and longest trial ever run on ginkgo found it did nothing: over a median 6.
Single-dose studies show small improvements in speed of thinking, but the one 12-week trial found nothing at all.
The mechanism is genuinely interesting — erinacines and hericenones induce nerve growth factor in vitro — but the human evidence amounts to two small Japanese trials and a pilot in mild Alzheimer's.
A potent acetylcholinesterase inhibitor sold as a supplement, which is a category error: it is pharmacologically a drug.
A semi-synthetic periwinkle alkaloid that is a prescription drug in much of the world and should not be treated as a food ingredient.
Guarana works, but almost certainly because it is a caffeine delivery system with 2-4 times the caffeine of coffee beans by weight.
Anthocyanin-rich blueberry preparations show small, inconsistent cognitive benefits, mostly in older adults who already have some decline.
The coffee cherry around the bean is polyphenol-rich and has a small set of mostly manufacturer-funded trials showing modest, inconsistent cognitive effects.
Feverfew is a long-popular migraine preventive whose best trial produced a difference of only 0.
Pregnenolone is the upstream neurosteroid precursor, marketed for memory and mood on essentially no data in healthy people.
L-serine is a non-essential amino acid with a genuine and growing clinical research program — but it is in rare neurological disease (serine biosynthesis defects, HSAN1, ALS trials), not in healthy people.
A handful of nootropic ingredients have modest individual evidence (caffeine plus L-theanine, citicoline, bacopa), but multi-ingredient "brain" blends are rarely tested as sold, usually under-dose the components, and a worrying share of the category has been found spiked with unapproved drugs.
Rosemary is an excellent food antioxidant with a famous but thin cognitive literature: the one controlled dose-ranging trial found 750 mg of rosemary powder helped memory speed slightly while 6000 mg made it worse.
Standardized spearmint extract (the rosmarinic-acid-rich Neumentix ingredient) has produced small, statistically significant attention improvements in a handful of trials — all funded by the ingredient's manufacturer.
DMAE (dimethylaminoethanol, deanol) was a prescription drug for childhood behaviour problems until the FDA withdrew it for lack of efficacy in the early 1980s.
A nucleotide sold as a synapse-building nootropic.
A synthetic CoQ10 analogue that is a licensed drug for a rare mitochondrial eye disease.
A lipophilic thiamine derivative that crosses into the brain more readily than thiamine.
A more soluble form of tyrosine sold for stress and focus.
The cheapest choline salt.
A Chinese root traditionally used for memory and restlessness.
An Ayurvedic brain tonic, usually Convolvulus pluricaulis.
The 'intellect tree' of Ayurveda, sold as a seed oil for memory.
An Amazonian holly leaf brewed as a caffeinated tea.
A West African seed chewed for alertness and once used to flavour cola drinks.
A Mediterranean herbal tea studied for cognition and neuroprotection.
An amyloid-binding compound (also known as tramiprosate) that failed its large Alzheimer's trial.
A class of brain phospholipids depleted in Alzheimer's disease and sold as scallop- or chicken-derived supplements.
A traditional Chinese rhizome used for headache and dizziness, whose main compound gastrodin has been tested for migraine.
A Chinese herb used traditionally for tremor, convulsions and hypertension, and best known in the West as an ingredient of the Kampo formula yokukansan.
Suspended gold nanoparticles marketed for focus, mood and joint comfort.
Multi-ingredient capsules typically built around ginkgo and phospholipids.
Combinations of omega-3s, zinc and calming herbs sold as nutritional support for attention.
Standardised for 6-MSITC, an isothiocyanate found in real wasabi rhizome.
Comparison guides for this category
Glycinate, citrate, malate, threonate, oxide and more
L-carnitine, acetyl-L-carnitine, L-carnitine L-tartrate or propionyl-L-carnitine?
Thiamine, benfotiamine, TTFD or sulbutiamine?
Is the active form of vitamin B2 worth paying more for?
Choline, bitartrate, alpha-GPC, citicoline or lecithin?
Plain caffeine, caffeine gum or caffeine + L-theanine?
Is the 'better-absorbed' acetylated form actually better?
Ginkgo, bacopa, lion's mane or huperzine A?
Goals these supplements are ranked for
What actually helps focus and memory, ranked by strength of evidence: caffeine, citicoline and bacopa lead, and the popular brain pills…
An evidence-ranked guide to supplements for preventing migraine: what has trial support, what carries real risk, and what to skip.
Our verdict
For everyday focus, caffeine, alone or with L-theanine, is the honest starting point, and bacopa is a slow, modest option for memory; for migraine prevention, high-dose riboflavin is the one worth discussing. Be sceptical of nootropic blends and memory formulas promising sharper thinking in healthy people, which have limited evidence.