Does fish oil help with migraine? What the research does and doesn't show

The evidence doesn't support fish oil, at any dose tested so far, as a reliable way to prevent migraine attacks. A 2018 meta-analysis of 13 trials found no effect on migraine frequency or severity, though it did find a reduction in attack duration. A larger 2025 dose-response meta-analysis of 22 trials found omega-3 supplementation had no significant effect on any migraine outcome measured.

What the evidence doesn't support

It doesn't support fish oil as a migraine prevention treatment on its own, and it doesn't support a specific dose as effective for migraine — the trials pooled below used a range of doses and forms that the published meta-analyses don't reduce to one number. It also doesn't support fish oil as more effective, or as effective, than a migraine medication; no comparison of that kind appears in the research reviewed here.

What the trials found

A 2018 systematic review and meta-analysis pooled results from randomized controlled trials of omega-3 fatty acids and migraine: of 13 eligible trials, 5 reported on attack frequency, 2 on duration, and 3 on severity. Omega-3 supplementation showed no significant effect on migraine frequency or severity, but it did produce a significant reduction in attack duration — about 3.44 hours shorter than control, on average. The authors called for larger, higher-quality trials to confirm the duration finding.

A larger 2025 systematic review and dose-response meta-analysis of 22 trials, covering multiple dietary supplements for migraine prophylaxis, evaluated omega-3 alongside magnesium, CoQ10, riboflavin, alpha-lipoic acid, probiotics and vitamin D. Several of those other supplements showed significant reductions in migraine frequency, severity or monthly migraine days; omega-3 supplementation did not yield a statistically significant reduction on any of those outcomes in adults.

Put together, the two most recent syntheses on this question don't agree with each other beyond one point: neither found a consistent reduction in migraine frequency. The 2018 review's positive finding was limited to attack duration, from just two trials; the larger, more recent 2025 analysis found no significant benefit on any measured outcome. That's a genuinely mixed, low-certainty picture, not a settled one.

Questions people ask

Does fish oil help with migraines?

The evidence is mixed and doesn't support a reliable effect on migraine frequency. One 2018 meta-analysis found a reduction in attack duration but not frequency or severity; a larger 2025 analysis found no significant effect on any migraine outcome.

How much fish oil should I take for migraines?

No dose has been established as effective for migraine specifically. The trials pooled in the meta-analyses above used a range of doses and forms that the published reviews don't reduce to a single recommended amount.

Has fish oil been tested against migraine medication?

No. The studies above tested fish oil against a placebo, not against a prescribed migraine medication, so this research doesn't answer how the two compare.

When to talk to a doctor

Migraine that's frequent, severe, or changing in pattern is worth evaluating with a doctor — there are established preventive and acute treatments with a stronger evidence base than fish oil currently has for this specific use. Fish oil is not a treatment for migraine, and nothing in the evidence above supports using it as a substitute for medical evaluation or a prescribed treatment plan.

Related reading: fish oil benefits: what's established and what isn't and fish oil and inflammation: what the research does and doesn't show.