Best Omega-3 Supplement UK (2026): Fish Oil and Algae Picks, Checked for EPA, DHA and IFOS Testing

Our picks at a glance

"Strong (testing)" means a published independent IFOS report or certification exists for the product. It does not mean the health claims are strong.

Do you need an omega-3 supplement at all?

EPA and DHA are long-chain omega-3 fats found mainly in oily fish such as salmon, sardines, mackerel and herring. The NHS advises at least two portions of fish a week, one of them oily. If you do that, a supplement adds little. If you do not eat fish, are vegan, or simply do not like it, a supplement is a reasonable way to fill the gap.

Plant foods like flax, chia and walnuts contain ALA, a shorter omega-3. Your body converts only a small amount of ALA into EPA and DHA, which is why algae oil (a direct source of EPA and DHA) is the better vegan option.

How we chose

We checked UK brand and retailer pages in October 2026 and recorded:

• EPA plus DHA per daily dose, not the total "fish oil" figure on the front of the pack. A "1,000mg fish oil" capsule may contain only 300mg of EPA and DHA.
• Independent testing: published IFOS batch reports, which check label accuracy, freshness and pollutants.
• Source and form: wild small fish, algae, triglyceride or ethyl ester.
• Cost per day at the brand's recommended dose.

Which omega-3 supplement should you buy?

Bare Biology Life & Soul Daily Capsules: best overall

Two capsules give 1,100mg EPA and 500mg DHA from wild sardines, anchovies and mackerel, with nothing added except natural vitamin E. The brand says every batch is IFOS certified, and IFOS has published five-star reports for its oils. Caveat: 1,600mg a day is well above the 250mg linked to normal heart function, and doses over 1g are associated with a higher risk of atrial fibrillation. Taking one capsule halves the dose and the cost.

Wiley's Finest Peak EPA: best one-a-day high EPA

One softgel gives 750mg EPA and 250mg DHA from wild Alaska pollock, and a published IFOS batch report gave five stars for label accuracy, freshness, PCBs, dioxins and heavy metals. Sold in the UK through Healf. Caveat: it is an ethyl ester concentrate, so take it with a meal. The retailer's ingredients panel shows conflicting figures; the IFOS report confirms 750mg EPA.

Myvitamins Essential Omega-3: best budget

One softgel gives 300mg omega-3 (180mg EPA, 120mg DHA), enough to meet the 250mg EPA plus DHA level in the GB health claim, at about 9p a day. Caveat: we found no IFOS-style test, and it is a standard 30% fish oil, so capsules are mostly other fats.

Together Health Algae Omega 3: best-value vegan

One softgel gives 123mg EPA and 207mg DHA from algae, which is the original source of the omega-3 in fish. At £14.99 it was the cheapest vegan option we checked. Caveat: no published third-party test, and EPA is lower than in fish oils.

DRV+ Vegan Omega 3: higher-dose vegan

300mg DHA and 150mg EPA per daily serving from algae, among the higher vegan doses we found. Caveat: about 50% more expensive than Together Health, and no published purity test.

Nordic Naturals Ultimate Omega: best triglyceride classic

Two lemon-flavoured softgels give 1,280mg omega-3 from wild sardines and anchovies in triglyceride form, with a five-star IFOS batch report. Caveat: the UK retailer page does not split EPA and DHA, the IFOS report we found is for an older US batch, and it is premium priced.

Wild Nutrition Pure Strength Omega 3: best for sustainability

Four capsules give 800mg EPA and 400mg DHA from MSC-certified fish, in a refillable glass jar. Caveat: MSC certifies that the fishery is sustainable; it does not test purity or freshness. Four capsules a day at £39 a month is a lot.

Bare Biology Life & Soul Liquid: highest dose, with care

A teaspoon gives 4,000mg omega-3. That is a dose for people whose clinician has advised it, for example for high triglycerides. Caveat: the atrial fibrillation and bleeding concerns grow with dose; refrigerate after opening and use within weeks.

What does the evidence say about omega-3?

The most complete review, a Cochrane analysis of 86 trials, found that extra EPA and DHA had little or no effect on deaths or overall cardiovascular events, with moderate to low certainty evidence for small reductions in coronary heart disease deaths and events, and a clear drop in triglycerides (a blood fat). The VITAL trial of 1g a day in over 25,000 healthy US adults found no reduction in major cardiovascular events or cancer.

The positive headline study, REDUCE-IT, used 4g a day of a purified prescription EPA in people with high triglycerides already on statins. It cut cardiovascular events, but it was funded by the drug's maker, its mineral oil placebo has been debated, and its results do not transfer to standard shop fish oils.

On the risk side, a 2021 meta-analysis found omega-3 supplements were associated with a higher risk of atrial fibrillation (an irregular heartbeat), especially at doses above 1g a day.

Who should be careful?

• People on anticoagulants or antiplatelets (warfarin, apixaban, rivaroxaban, clopidogrel): ask your GP or pharmacist, especially at high doses.
• People with atrial fibrillation or palpitations: discuss before starting.
• Before surgery: tell the surgical team.
• Fish or shellfish allergy: choose algae oil and check the label.
• Pregnancy: avoid cod liver oil and other vitamin A-rich liver oils; ask your midwife about DHA.

What to avoid

• Judging strength by "1,000mg fish oil" on the front. Check EPA and DHA on the back.
• Oils that smell strongly of rotten fish when you open a capsule: a sign of oxidation.
• Krill oil at premium prices: doses of EPA and DHA per capsule are usually low.
• Cod liver oil as your main omega-3 if you also take vitamin D or A supplements.

Bottom line

Eating oily fish once a week is the simplest route. If you do not, a daily 250 to 1,000mg of EPA plus DHA from a tested product is a sensible top-up, and there is little reason to go higher without medical advice. Bare Biology Life & Soul and Wiley's Finest Peak EPA offer published IFOS testing; Myvitamins covers the basics cheaply; Together Health is the best-value vegan choice. Do not expect a supplement to protect your heart on its own.