Does omega-3 (fish oil) help hot flashes? Evidence

Does omega-3 help menopause symptoms?

This is not medical advice — it is general information based on what you searched for that may help.

General information based on published sources and the symptoms you searched for. This isn't medical or legal advice, a diagnosis or a treatment plan. Please consult a doctor about your own symptoms. If your symptoms are severe or sudden, seek urgent care.

Our verdict: Not recommended as a treatment for hot flashes, sleep, or mood.

Omega-3 fatty acids (commonly taken as fish oil) are widely marketed for menopause symptoms, including hot flashes. A well-designed, double-blind randomized controlled trial from the MsFLASH research network — a well-regarded NIH-funded clinical trials network focused specifically on menopause symptoms — tested this directly in 355 women.

What the trial actually found

Women took either 1.8 grams per day of omega-3 (EPA and DHA) or a placebo for 12 weeks. The results were clear:

Hot flash frequency: No significant difference from placebo (a relative difference of just 0.3 fewer hot flashes per day, which was not statistically significant).
Hot flash bother: No significant difference from placebo.
Sleep and mood: No improvement in self-reported sleep quality or mood compared with placebo.

This wasn't a small or poorly controlled study — it was double-blind and reasonably well-powered, which makes this a fairly solid null result rather than just "not enough evidence yet."

Why this one is worth taking seriously as a "no"

A lot of supplement verdicts on this site land on "evidence is mixed" or "too early to tell." This one is more clear-cut: a trial specifically designed to test this question, in a relevant population, found no benefit across every outcome it measured.

What has stronger evidence

See our non-hormonal treatments overview for Level I prescription and behavioral options for hot flashes, or the insomnia page for sleep-specific options with real supporting evidence. Use our Does it work? evidence checker to compare every graded option.

Since omega-3 didn't show a benefit for my main symptoms, which Level I option should I consider instead?
Are there other, non-menopause reasons I should still consider omega-3 supplementation (such as cardiovascular health)?

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Questions people ask

Does fish oil (omega-3) help hot flashes?

According to a well-powered, double-blind randomized trial from the MsFLASH research network, no — 1.8g per day of omega-3 for 12 weeks did not significantly reduce hot flash frequency or bother compared with placebo.

Does omega-3 at least help with sleep or mood during menopause?

The same trial specifically tested this and found no improvement in self-reported sleep quality or mood with omega-3 compared with placebo. This was a well-designed trial, not just a small or poorly controlled one, so this is a fairly solid null result.