Does omega-3 make you sharper?
Omega-3 for Your Brain: Promising, but the Evidence Is Messier Than the Headlines
· By Anthony Falcone
Verdict: Too early to tell. Possibly, a little. This review found modest improvements in several cognitive tests, but the studies disagree with each other and earlier reviews found no clear benefit. Take omega-3 for the reasons with stronger evidence, not as a brain booster.
What the researchers did
The team pooled 58 trials (published 2006–2023) that gave adults omega-3 supplements — anywhere from 230 mg to almost 5 g a day — and measured memory, attention, processing speed and other cognitive skills. Just over half were in cognitively healthy people.
What they found
Omega-3 was associated with modest improvements in several areas, including processing speed, short-term memory and visuospatial skills. The most consistent effects appeared between 1,000 and 2,500 mg a day, with no adverse effects reported in that range.
Benefits looked larger in cognitively healthy people and in shorter trials (under 48 weeks).
Why we're not convinced yet
The authors themselves flag that most included studies were low quality, results varied enormously between trials, and removing a handful of studies changed several conclusions.
Two earlier reviews found no clear cognitive benefit from omega-3 in the general population or in age-related decline. This review argues the difference comes from dose and which skills were measured — plausible, but not settled.
What this means for you
- Omega-3 can still earn a place in a basic stack for other reasons; just don't buy it as a focus pill.
- If you supplement, the most-studied range for brain outcomes was 1–2.5 g a day. More wasn't clearly better.
- Don't expect a noticeable boost in focus. Sleep, exercise and caffeine timing have far stronger evidence.
How much to trust it
- Most included studies were rated as low quality.
- Very high variation between studies in people, doses, durations and cognitive tests.
- Results for some outcomes depended on just a few studies.
The study
Shahinfar H, Yazdian Z, Avini NA, Torabinasab K, et al. A systematic review and dose response meta analysis of Omega 3 supplementation on cognitive function. Scientific Reports, 2025. doi.org/10.1038/s41598-025-16129-8
Our Supplement Stack Protocol covers omega-3 dosing and EPA/DHA ratios as part of the four supplements worth taking, and why. See the protocol