VITAMINS & SUPPLEMENTS · GUIDE
Omega-3, Magnesium L-Threonate and Creatine for the Brain: Where Each Is Covered
A map to the omega-3, magnesium L-threonate and creatine pages, with one review-level finding each on memory and thinking and why results are not interchangeable.
Content last updated . This page has not been medically reviewed.
Back to Omega Fatty Acids Explained: Omega-3, Omega-6 and Omega-9Quick answer
Omega-3 fats, magnesium L-threonate and creatine are often listed in brain-health supplement articles. Each belongs to a different library on this site, so this page gives one finding per ingredient and links to the full page. It is information only, with no amounts and no advice to use anything.
Evidence labels: promising but limited, mixed, insufficient evidence, no good evidence of benefit. See nootropic evidence by outcome for the wider picture.
One finding for each
| Ingredient | What the source found | Label | Where to read |
|---|---|---|---|
| Omega-3 (long-chain EPA and DHA) | A review of seven trials (four in cognitively healthy older people, three in people with cognitive decline or dementia) found "no evidence to support the routine use" of these supplements for preventing or easing cognitive decline in later life. [1] A 2024 meta-analysis in Alzheimer's disease found less progression on one rating scale (CDR) but no significant differences on MMSE or ADAS-cog. [2] | Insufficient to mixed | Omega-3 evidence by use, omega-3 and B-vitamin trials for brain health |
| Magnesium L-threonate | Two trials reported better test scores than placebo: one 30-day trial in 109 healthy Chinese adults used a formula that also contained phosphatidylserine and vitamins, so the effect cannot be assigned to magnesium alone. [3] The other, a 6-week trial in 100 adults aged 18 to 45 with dissatisfied sleep, was funded by the company that supplied the product. [4] | Promising but limited | Magnesium forms compared, magnesium |
| Creatine | A 2024 meta-analysis of 16 trials (492 people, all creatine monohydrate) found a positive effect on memory (moderate certainty) but not on overall or executive function. [5] Another review found short-term memory and reasoning may improve in healthy people, with other domains conflicting. [6] | Promising but limited | Creatine for older adults, women and cognition, creatine |
How to read the table
- The groups differ: older adults and people with dementia (omega-3 reviews), healthy adults of 18 to 65 (magnesium L-threonate), mixed healthy and clinical groups aged 20.8 to 76.4 (creatine). [1][3][5] Results do not transfer across groups.
- The tests differ. A rating scale, a memory test and a reaction-time task measure different things, and short lab tasks are not everyday performance.
- Whether magnesium L-threonate is better than other magnesium forms for the brain: Proper evidence not found in the head-to-head comparisons we looked for. The trials above had placebo, not another magnesium form, as the comparator. [3][4]
- Evidence in a different population may not apply to you. Ask a clinician.
Frequently asked questions
Does omega-3 prevent memory loss?
A review of seven trials found no evidence to support routine use for preventing or easing cognitive decline in later life. [1]
Does magnesium L-threonate improve memory?
Two trials reported better scores than placebo, but one tested a multi-ingredient formula and one was company-funded. [3][4] Larger independent trials are not described in the sources we read.
Does creatine help the brain?
A 2024 meta-analysis found a positive effect on memory, with moderate certainty, and none on overall cognition. [5]
Which one is best for the brain?
No universal winner; the studies used different groups, tests and comparators.
Where can I read the full guides?
Use the links in the table, or the Nootropics hub.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety and when to ask first
- Medicines: each ingredient has its own cautions, covered on its full page; none is assumed here. Ask a pharmacist and read medication interactions.
- Pregnancy, children, older adults, kidney or liver conditions: ask a clinician first (pregnancy and breastfeeding, minerals and kidney disease).
- Surgery: tell your surgical team about every supplement (supplements before surgery).
- Memory change: new or worsening memory problems need a clinician: mild cognitive impairment and dementia. Do not stop a prescribed medicine on your own.
References
- Dangour AD et al. Br J Nutr 2012. n-3 fatty acids and cognitive function in later life: review of trials. Read 2026-10-23.
- The effects of omega-3, DHA, EPA, Souvenaid in Alzheimer's disease: a systematic review and meta-analysis. Neuropsychopharmacol Rep 2024. PubMed record. Read 2026-10-23.
- A Magtein, Magnesium L-Threonate, -Based Formula Improves Brain Cognitive Functions in Healthy Chinese Adults. Nutrients 2022. PubMed record. Read 2026-10-23.
- Lopresti AL, Smith SJ. Front Nutr 2026. The effects of magnesium L-threonate on cognitive performance and sleep quality in adults: a randomised, double-blind, placebo-controlled trial. Read 2026-10-23.
- The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Front Nutr 2024. PubMed record. Read 2026-10-23.
- Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Exp Gerontol 2018. PubMed record. Read 2026-10-23.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.