Best Omega-3 Supplement UK: 2026 Buying Guide

Fish oil is one of the most bought and least understood supplements on the shelf. Most UK buyers pick one on price or a "high strength" label and assume that's the job done. It usually isn't — the number that actually matters is buried in the small print, and it's rarely the big number on the front of the tub.

Here's what actually separates a good omega-3 supplement from a wasted one: how much EPA and DHA you're really getting (not total fish oil weight), the molecular form it's delivered in, and whether the oil is fresh enough not to have oxidised before it reached you.

1. EPA + DHA, not "fish oil mg"

A capsule can say "1000mg fish oil" while only 30–40% of that is actually active EPA and DHA — the rest is other fats that do very little for you. Good Fats states its EPA and DHA content directly: 1000mg of fish oil providing 500mg EPA and 250mg DHA per capsule, a 75% active concentration. Always check for the EPA/DHA breakdown, not just the total fish oil figure.

2. How much do you actually need?

The NHS recommends at least 250mg of combined EPA and DHA per day for most adults. One capsule of Good Fats already clears that. People taking omega-3 for a specific reason (joints, cardiovascular support) often take up to three capsules a day for a fuller dose — still a small handful, not a spoonful of oil.

3. Freshness and oxidation

Fish oil degrades over time and with exposure to heat and light. Oxidised fish oil is where the "fishy burp" reputation comes from — it's not an inherent feature of omega-3, it's a sign of an oil that's gone off before you took it. Buying from a supplier with real UK stock turnover (rather than a supplement that's sat in a warehouse for a year) matters more than most labels let on.

4. Per-capsule cost, not per-bottle

A cheap 30-capsule bottle that only gives you 100mg of combined EPA/DHA per capsule can work out more expensive per effective dose than a pricier bottle with 750mg per capsule. Good Fats works out at roughly £0.23/day for the entry dose (one capsule), rising to about £0.70/day for three.

How the options compare

*Supermarket and premium standalone figures are typical UK market ranges as of 2026, not quotes from a named competitor.

FAQ

Is fish oil or algae oil better?

Fish oil (like Good Fats) delivers EPA and DHA directly. Algae oil is a genuine plant-based source of the same actives and a reasonable choice for vegans, though doses per capsule are often lower, so check the EPA/DHA figures the same way.

How much omega-3 do I need per day in the UK?

The NHS recommends at least 250mg of combined EPA and DHA daily for general health. One capsule of Good Fats meets that; up to three capsules a day is a common fuller dose for joint or cardiovascular support.

Does fish oil cause fishy burps?

That's usually a sign of oxidised (stale) oil rather than something inherent to omega-3. Fresher stock and taking capsules with food both help.

Can I take omega-3 alongside other supplements?

Yes, it's food-based. As with any supplement, check with your GP if you're on blood-thinning medication, since omega-3 can have a mild effect on clotting at high doses.