Which omega-3 supplement should women in perimenopause take?

In the UK, a supplement is not a default part of perimenopause, and two portions of fish a week, one of them oily, covers most people. If you do take one, choose by the EPA and DHA per daily dose on the back of the pack, and look for at least 250 mg of the two combined.

• EPA and DHA contribute to the normal function of the heart. That is an authorised claim, conditioned on 250 mg of the two combined per day.
• The front of a pack usually gives the weight of oil. The EPA and DHA inside it is what the claim and the trials are about, and it is listed on the back.
• UK advice is at least two portions of fish a week, one of them oily. A woman who could become pregnant should keep oily fish to two portions a week.

Start with whether you need one

Omega-3 supplements are not a standard part of perimenopause, and there is no authorised claim and no trial evidence linking them to any menopause-specific benefit. The reason they come up on a perimenopause site is that cardiovascular risk rises for women across the transition, which makes heart health a more prominent consideration than it was a decade earlier.

UK dietary advice is at least two portions of fish a week, one of them oily, such as salmon, mackerel, sardines or trout [2]. A woman who could become pregnant is advised to keep oily fish to two portions a week [2]. If you already eat that way, a capsule adds little. If you do not, a supplement is one way to close the gap, and this page is about choosing one well.

Read the back of the pack

If you choose a supplement, compare the EPA and DHA amounts per recommended daily dose rather than the total fish-oil weight on the front.

The front of a pack usually gives the weight of oil, for example 1,000 mg. That is not the weight of the two fatty acids that the evidence and the authorised claim are about. Turn the pack over and look for EPA and DHA listed separately, in milligrams, per the stated daily dose. As an example, an ordinary 1,000 mg fish-oil capsule may list around 300 mg of EPA and DHA combined, while a concentrated product can list several times that. Two products with the same figure on the front can differ a great deal in the thing you are buying them for.

The number behind the claim

EPA and DHA contribute to the normal function of the heart. That is a GB-authorised health claim, and the register sets its condition: the beneficial effect is obtained with a daily intake of 250 mg of EPA and DHA combined [3]. A product may carry the claim when it meets the register's conditions, including that intake.

That figure is a condition attached to a claim about normal heart function. It is not a recommendation that every woman in perimenopause should take a capsule. Higher intakes, commonly 1 to 2 grams a day, appear in cardiovascular research; that is a research context, not general guidance.

What the large trial found

A randomised trial gave 25,871 US adults, men aged 50 and over and women aged 55 and over, either 1 g of fish oil a day, supplying about 840 mg of EPA and DHA combined, or a placebo, and followed them for a median of 5.3 years [1]. Major cardiovascular events, a composite of heart attack, stroke and cardiovascular death, were not significantly lower: the hazard ratio was 0.92, with a confidence interval from 0.80 to 1.06. A hazard ratio below 1 means fewer events, and an interval that includes 1 means the difference could be chance. Heart attacks on their own were less frequent, at 0.72 with an interval from 0.59 to 0.90, which is a secondary result and does not change the primary one. Invasive cancer was unchanged. No excess bleeding was seen [1].

That is a mixed result, and the population was older than perimenopause, so it is not direct evidence for the reader of this page.

Form

Fish oil is sold in triglyceride form and as ethyl esters. Absorption studies generally favour the triglyceride form at the same stated EPA and DHA content; the difference is modest, and smaller than the difference between a product supplying 300 mg and one supplying 1,000 mg.

Algal oil is the option for anyone vegetarian or vegan. Many algal products supply DHA only, and the heart claim rests on EPA and DHA together, so check that both are listed and that the combined figure reaches 250 mg.

Buy a size you will finish and keep it cool, since fish oil oxidises over time.

Where this leaves you

Fish first, per the NHS advice above. If you supplement instead, pick by the EPA and DHA per daily dose on the back, not the oil weight on the front. If you take a blood-thinning medicine or have a fish or shellfish allergy, check with a pharmacist before starting. Nothing in the evidence says an omega-3 capsule does anything specific for perimenopause, and this page does not claim it does.

Published by: Suggestic Inc, herstack.co.uk. The HerStack editors. 2026-09-26. This page has not been reviewed by a clinician.