Best Omega-3 Supplements UK 2026
Last updated: 1 June 2026 · 10 products reviewed
Omega-3 (EPA and DHA) supports heart, brain and joint health, yet the supplement market varies enormously in quality. The form of the oil (triglyceride vs ethyl ester), purity certification, oxidation, and EPA+DHA content all matter far more than the total 'fish oil' weight on the label. We ranked the 10 best omega-3 supplements in the UK across all these factors.
Our Top 3 Picks at a Glance
Comparison Table
| # | Product | Form | EPA+DHA | Price | Cost/Serving | Score | Award |
|---|---|---|---|---|---|---|---|
| 1 | Inessa Advanced Omega-3 Inessa | Softgel | 840mg EPA+DHA | £16.99 | £0.28 | 9.4 | Best Overall |
| 2 | Sports Research Triple Strength Omega-3 Sports Research | Softgel | 900mg EPA+DHA | £13.99 | £0.16 | 8.8 | Best Value |
| 3 | Seven Seas Max Strength + Vitamin D Seven Seas | Capsule | 1063mg EPA+DHA | £9.99 | £0.17 | 8.6 | Best High-Street Pick |
| 4 | Ritual Omega-3 DHA (Vegan) Ritual | Softgel | 450mg EPA+DHA (vegan) | £23.99 | £0.80 | 8.4 | Best Vegan |
| 5 | Transparent Labs Omega-3 Fish Oil Transparent Labs | Softgel | 600mg EPA+DHA | £18.99 | £0.32 | 8.3 | — |
| 6 | Luma Nutrition Omega-3 Fish Oil Luma Nutrition | Softgel | 520mg EPA+DHA | £19.99 | £0.33 | 8.1 | — |
| 7 | BioCare Vegan Omega-3 (Algae) BioCare | Softgel | 300mg EPA+DHA (vegan) | £21.99 | £0.73 | 7.9 | — |
| 8 | Nutricost Omega-3 Fish Oil Nutricost | Softgel | 500mg EPA+DHA | £7.99 | £0.07 | 7.9 | Cheapest |
| 9 | Futuro Labs Omega-3 Futuro Labs | Softgel | 600mg EPA+DHA | £14.99 | £0.25 | 7.8 | — |
| 10 | Generic Amazon Omega-3 Fish Oil Various (Amazon) | Softgel | ~300mg EPA+DHA (unverified) | £5.99 | £0.05 | 6.2 | — |
Inessa Advanced Omega-3
Softgel
Sports Research Triple Strength Omega-3
Softgel
Seven Seas Max Strength + Vitamin D
Capsule
Ritual Omega-3 DHA (Vegan)
Softgel
Transparent Labs Omega-3 Fish Oil
Softgel
Luma Nutrition Omega-3 Fish Oil
Softgel
BioCare Vegan Omega-3 (Algae)
Softgel
Nutricost Omega-3 Fish Oil
Softgel
Futuro Labs Omega-3
Softgel
Generic Amazon Omega-3 Fish Oil
Softgel
Detailed Reviews & Rankings
Inessa's Advanced Omega-3 is our top pick — IFOS 5-star certified, in the superior triglyceride form, sustainably sourced, and delivering 840mg EPA+DHA in a single daily softgel.
Pros
- IFOS 5-Star certified — the top global purity standard
- Triglyceride form for ~30% better absorption than ethyl ester
- Friend of the Sea sustainable sourcing (wild anchovies, low mercury)
Cons
- Premium price per mg of EPA+DHA
- Single sourcing (anchovy) won't suit those wanting larger fish variety
- Not vegan (fish-based)
Sports Research delivers the highest EPA+DHA per serving (900mg) with both IFOS and MSC certification, in the superior triglyceride form — our best-value pick at 15% cheaper per mg than Inessa.
Pros
- Highest EPA+DHA per serving in our test (900mg)
- IFOS certified AND MSC certified (top sustainability standard)
- Triglyceride form for superior absorption
Cons
- Slightly less detail on triglyceride guarantee than Inessa
- Larger softgel size
- Not vegan
Seven Seas is the trusted high-street choice — a heritage UK brand with high EPA+DHA, added Vitamin D, and single-capsule convenience at a low price, though testing detail trails the premium picks.
Pros
- Established UK heritage brand — high trust
- Added Vitamin D3 for synergistic heart and bone health
- Single daily capsule convenience
Cons
- Less detail on third-party testing than Inessa or Sports Research
- Form (triglyceride vs ethyl ester) not always clearly stated
- Not IFOS certified
Ritual's algae-based omega-3 is the best vegan option — sustainable, mercury-free, and highly transparent — though it delivers less EPA+DHA per serving at a premium price.
Pros
- Algae-based — fully vegan and sustainable (no fish)
- Traceable sourcing with high transparency
- No fishy aftertaste
Cons
- Lower EPA+DHA per serving (450mg, needs 2 softgels)
- Premium price for the dose delivered
- Smaller container (30 servings)
Transparent Labs lives up to its name with clear labelling and third-party testing, offering a solid 600mg EPA+DHA dose at a fair mid-range price.
Pros
- GMP and third-party tested
- Transparent labelling (brand signature)
- Solid 600mg EPA+DHA dose
Cons
- Mid-range EPA+DHA per serving
- Requires 2 softgels per serving
- Mid-range pricing
Luma Nutrition offers a premium-sourced, third-party-tested fish oil with a respectable 520mg EPA+DHA, though the oil form is unclear and the price is on the higher side for the dose.
Pros
- Premium-sourced fish oil
- Third-party tested
- Decent 520mg EPA+DHA dose
Cons
- Extraction/oil form unclear
- Mid-range EPA+DHA at a higher price
- Less brand recognition
BioCare's algae-based omega-3 is a clean, organic vegan option from a reputable UK brand, but the low 300mg EPA+DHA per serving means you'll need multiple softgels to hit a useful dose.
Pros
- Micro-algae source — vegan and sustainable
- Organic certified
- Reputable UK health brand
Cons
- Low EPA+DHA per serving (300mg, needs 2-3 softgels)
- Premium price for the dose
- Small container
Nutricost is the budget pick — cheap, with a decent 500mg EPA+DHA dose and a big container — but minimal testing transparency and unspecified oil form hold it back.
Pros
- Very low price and large container
- Decent 500mg EPA+DHA dose
- Good cost per serving
Cons
- Minimal testing transparency
- Oil form not specified
- No sustainability certification
Futuro Labs offers a solid 600mg EPA+DHA dose with GMP and third-party testing at a fair price, though it's a less established brand without sustainability certification.
Pros
- Good 600mg EPA+DHA dose
- GMP and third-party tested
- Mid-range pricing
Cons
- Less established brand
- Oil form not clearly stated
- No sustainability certification
Generic Amazon fish oil is cheap but a gamble — unknown sourcing, often the poorly-absorbed ethyl ester form, and frequently oxidised out of the box. Not recommended over verified options.
Pros
- Cheapest option
- Large softgel counts
- Easy to find
Cons
- Unknown sourcing and variable purity
- Often ethyl ester form (lower absorption)
- Frequently oxidised (rancid, fishy burps)
How to Choose a Omega-3 Supplement
EPA+DHA Is What Counts — Not Total Fish Oil
The number that matters is the EPA+DHA content, not the total 'fish oil' weight. A '1000mg fish oil' capsule might contain only 300mg of actual EPA+DHA. The NHS suggests at least 250mg EPA+DHA daily; for heart and anti-inflammatory benefits, 500–1000mg is common. Always read the EPA+DHA figure on the back, not the fish oil figure on the front.
Triglyceride vs Ethyl Ester Form
Triglyceride form is the natural form found in fish and absorbs around 30% better. Ethyl ester is a cheaper synthetic form created during concentration and absorbs less efficiently. Premium brands (Inessa, Sports Research) use triglyceride form; many budget brands use ethyl ester without saying so. If absorption matters, choose a stated triglyceride product.
Certifications: IFOS and MSC
IFOS 5-Star is the top purity standard — testing potency, contaminants (mercury, PCBs, dioxins) and oxidation. MSC (Marine Stewardship Council) is the strictest sustainability standard. Friend of the Sea is a good sustainability marker too. Products with IFOS and/or MSC (Inessa, Sports Research) sit at the top of the trust hierarchy.
Oxidation and Mercury
Omega-3 oils oxidise easily and rancid oil causes the fishy burps and reduces benefit. Quality brands test oxidation levels and use antioxidants. For low mercury, choose oils from small, short-lived fish (anchovies, sardines) or cold-water species — they accumulate far less mercury than large fish. Algae oil is naturally mercury-free and vegan.
Omega-3 FAQ
What is the best omega-3 supplement in the UK?
Inessa Advanced Omega-3 is our top pick — IFOS 5-star certified, triglyceride form, 840mg EPA+DHA in one daily softgel. Sports Research is the best value, and Seven Seas the best high-street option.
How much EPA+DHA do I need daily?
The NHS suggests at least 250mg of combined EPA+DHA per day. For heart, brain and anti-inflammatory benefits, 500–1000mg daily is commonly used. Focus on the EPA+DHA figure, not the total fish oil weight.
What's the difference between triglyceride and ethyl ester omega-3?
Triglyceride is the natural form found in fish and absorbs about 30% better. Ethyl ester is a cheaper synthetic form. Premium brands use triglyceride form; if absorption matters, choose a product that clearly states it.
Is vegan algae omega-3 as good as fish oil?
Algae oil provides the same pre-formed EPA and DHA as fish oil (fish get it from algae originally). It's the best vegan option. The trade-offs are usually a lower EPA+DHA dose per capsule and a higher price.
Why do fish oil capsules cause fishy burps?
Fishy burps usually indicate oxidised (rancid) oil or the ethyl ester form. Quality oils are tested for oxidation and use the triglyceride form, which is why premium products don't cause the fishy aftertaste.