Which omega-3 has the highest EPA and DHA?

The league table, bottom to top, with the physics at each rung

Rank the market by EPA and DHA per capsule and the table climbs in clean steps. Base: standard fish oil at 30% concentration, 300mg per 1000mg softgel, the natural profile of refined oil. Mid-table: mainstream concentrates at 50% to 65%, 500mg to 650mg per capsule, ethyl ester processing doing the enriching. Upper rows: premium concentrates, usually re-esterified triglyceride, at 70% to 90%, 700mg to 900mg per capsule, the retail ceiling where molecular distillation earns its price. Top of the table: prescription-grade preparations, omega-3-acid ethyl esters at roughly 84% with purified-EPA products beyond, pharmaceutical rows reached only through a prescriber. And two entries that outflank capsules entirely: concentrated liquid oils, whose teaspoon servings deliver 2g to 3g in one swallow, the highest per-serving numbers money can buy retail; and the oily fish portion, a few grams of EPA and DHA per tin, which quietly out-delivers every capsule on the table while feeding you.

Reading the table honestly: who each row is for, and where more stops meaning better

The table's practical value is matching rows to jobs rather than climbing it for sport. The base row completes the everyday authorised territory, 250mg combined, in one capsule at the lowest price, which is most readers' whole requirement. The concentrate rows exist for two buyers: the gram-scale user, chasing the 2g blood-triglyceride claim or research protocols, for whom 750mg capsules turn seven-softgel days into two-capsule ones; and the 250mg-DHA claim target, met by DHA-weighted upper rows. The prescription row is not shopping at all, an indication and a monitoring plan wearing a capsule. And the ceiling on meaning arrives fast: EFSA's safety opinion caps supplemental comfort near 5g, the high-dose meta-analyses attach the atrial fibrillation signal to gram-scale routines, and no claim anywhere rewards exceeding its own threshold, so past your target number the table's height buys exactly one thing, fewer swallows, priced per gram like everything else on this section's audits.

The verdict, and the base row worn without apology

Which omega-3 has the highest EPA and DHA: prescription-grade preparations by concentration, premium rTG concentrates and liquid oils by retail serving, and the tin of mackerel by sheer delivery, with the useful answer being the row your actual target lives on rather than the table's summit. The worked example occupies the base row deliberately: Futuro Labs Omega 3 Fish Oil, 300mg of EPA and DHA per softgel, the everyday claim threshold cleared in one capsule at £14.99 for 90 days, 17p a day, lab-tested, UK made, presented throughout this section as exactly what it is, the standard-strength answer to the standard-sized question, with every reader whose target genuinely sits higher handed the concentrate checklist and, where the numbers came from a blood test, the GP referral the upper rows properly require.

What to check on the label

Questions people also ask

What is the strongest omega-3 you can buy in the UK?

Retail, premium rTG concentrates around 700mg to 900mg per capsule and concentrated liquids at 2g to 3g per teaspoon. Stronger still is prescription grade, which arrives with an indication.

Is a higher EPA and DHA capsule better?

Only toward a target you actually hold: past the 250mg everyday threshold, extra milligrams buy convenience at gram-scale jobs, not extra benefit at everyday ones.

Which single capsule has the most EPA and DHA?

The best rTG concentrates reach 900mg-ish combined: the retail ceiling set by capsule volume and 90% oils.

Are liquid fish oils stronger than capsules?

Per serving, yes: a teaspoon of concentrated liquid carries what several capsules would. Freshness discipline matters more in an opened bottle.

Should I buy the highest-strength product to be safe?

No: safety runs the other way, with EFSA's comfort ceiling near 5g and the high-dose AF signal. Buy the row your target needs, which for most people is the 300mg base.

Sources

1. Futuro Labs Omega 3 Fish Oil listing: 1000mg fish oil per softgel providing 180mg EPA and 120mg DHA, 90 softgels. Amazon UK, accessed 31 August 2026. https://www.amazon.co.uk/dp/B0CP9T3BTN
2. Electronic medicines compendium (emc): Summaries of Product Characteristics for omega-3-acid ethyl esters 1000mg capsules (Omacor and generics) and icosapent ethyl (Vazkepa). https://www.medicines.org.uk/emc/search?q=omega-3-acid+ethyl+esters
3. EFSA Panel on Dietetic Products. Scientific opinion on the tolerable upper intake level of EPA, DHA and DPA: supplemental intakes of EPA and DHA combined up to about 5g/day do not raise safety concerns for adults. EFSA Journal 2012;10(7):2815. https://www.efsa.europa.eu/en/efsajournal/pub/2815
4. Gencer B, Djousse L, Al-Ramady OT, et al. Effect of long-term marine omega-3 fatty acids supplementation on the risk of atrial fibrillation in randomized controlled trials: a systematic review and meta-analysis. Circulation 2021;144(25):1981-1990. PubMed record
5. EFSA Panel on Dietetic Products. Scientific opinion on the substantiation of health claims related to EPA and DHA and normal function of the heart (250mg daily condition of use). EFSA Journal 2010;8(10):1796. https://www.efsa.europa.eu/en/efsajournal/pub/1796
6. Dyerberg J, Madsen P, Møller JM, Aardestrup I, Schmidt EB. Bioavailability of marine n-3 fatty acid formulations. Prostaglandins, Leukotrienes and Essential Fatty Acids 2010;83(3):137-141. PubMed record

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