Omega-3 in the UK: Fish Oil vs Algae, and How to Choose

Omega-3 is one of the most talked-about supplements in the UK, largely because most of us eat very little oily fish. If you have ever stood in front of a shelf of fish oil capsules wondering why the prices vary so wildly, or whether the vegan version is any good, this guide is for you. We will cover what EPA and DHA are, how to read a UK label, how to compare cost, and why freshness matters.

What omega-3 actually is: EPA, DHA and ALA

Omega-3 is an umbrella term for a family of essential fatty acids. The body cannot make them in meaningful amounts, so they come from food or supplements. Three names come up again and again:

• EPA (eicosapentaenoic acid) — a long-chain omega-3 found in oily fish and certain marine algae.
• DHA (docosahexaenoic acid) — the other long-chain omega-3, from the same sources.
• ALA (alpha-linolenic acid) — the plant form, found in flaxseed, chia, walnuts and rapeseed oil. The body converts only a small fraction of ALA into EPA and DHA, which is why many people look to fish or algae sources directly.

Why omega-3 comes up so often in the UK

The NHS Eatwell Guide suggests two portions of fish a week, one of them oily — salmon, mackerel, sardines, herring or trout. National diet surveys have consistently found average oily fish intake across the UK sits well below that. Fresh oily fish is not cheap, many people dislike it, and plenty of British households never cook it. That gap between the guidance and the weekly shop is the honest, unglamorous reason omega-3 is so common in British cupboards — the same practical logic behind vitamin D through our darker months. Both sit in our Vitamins & Health range.

Fish oil vs algae oil (the vegan option)

Traditional omega-3 supplements are made from oily fish. They are widely available, usually the cheapest route to EPA and DHA, and come as softgels or flavoured liquids. The trade-off some people notice is a fishy repeat, which tends to be worse with older or lower-grade oil.

Algae oil is the plant-based alternative, and it is genuinely neat: fish get their omega-3 from the algae they eat, so algae oil goes straight to the original source. Algae products were once DHA-only and expensive; combined EPA and DHA versions are now common, though still pricier per gram. If you do not eat fish, algae oil is the straightforward choice. If sustainability matters to you, look for recognised marks on the pack such as MSC certification for wild-caught oils.

How to read the label properly

This is the most useful skill when comparing omega-3 products, and it catches people out. The big number on the front — say "1000mg fish oil" — is the total oil per capsule, not the amount of omega-3 in it. What counts is the EPA and DHA content, which UK packs list in the panel on the back.

• Ignore the front-of-pack oil weight and find the EPA and DHA figures.
• Add EPA + DHA together for the combined amount per serving.
• Check the serving size. Some labels quote figures for two or three capsules, which makes a product look stronger than it is per capsule.
• Compare cost per gram of EPA+DHA, not cost per bottle.

As a rough benchmark, a standard 1000mg fish oil capsule often contains around 300mg of combined EPA and DHA, while concentrated "triple strength" softgels carry considerably more. Follow the label directions for how many to take.

Cost per gram: a quick example

Say a £10 tub holds 200 capsules at 300mg combined EPA+DHA each. That is 60g of EPA+DHA — about 17p per gram. A £16 tub of 90 concentrated capsules at 700mg each gives 63g, so roughly 25p per gram. The cheaper tub wins on value, but you swallow more capsules to get there. Run that sum and the headline "bargain" bottles often stop looking like bargains.

Freshness: the detail most people miss

Omega-3 oils are delicate and can oxidise when exposed to heat, light and air. A strongly fishy smell or bitter, off taste often means the oil has degraded. A few habits help:

• Check the best-before date and buy from a retailer with good stock turnover, not a bottle that has sat on a shelf for a year.
• Store it sensibly — a cool, dark cupboard is fine, and the fridge can also cut down the repeat.
• Look for added antioxidants such as vitamin E (tocopherol), which manufacturers include to help protect the oil.
• Trust your senses. If a capsule tastes rancid, do not push through it.

Freshness is the quality signal worth paying a little extra for — a well-made oil is more pleasant to take day to day.

Who tends to take omega-3?

Most people fold it into their routine as a general dietary top-up, particularly if oily fish rarely makes the menu: vegans and vegetarians (usually via algae oil), gym-goers who keep it beside the basics of their training nutrition such as their protein powder or creatine, and busy people whose meals repeat week to week. It works best as one part of a balanced diet rather than something to lean on in isolation.

One UK-specific note: fish-liver oils such as cod liver oil also contain vitamin A, and NHS advice is that people who are pregnant should avoid supplements containing it — so check the product and speak to a midwife, GP or pharmacist first.

Shop omega-3 at NE Commerce

You will find fish oil and vegan algae omega-3 in our Vitamins & Health collection, with EPA and DHA figures listed clearly so you can compare at a glance. Pick a fresh, well-concentrated product at a fair price per gram. For more jargon-free guides, browse the NE Commerce blog.

The information here is general and educational. Food supplements are intended to complement — not replace — a varied, balanced diet and a healthy lifestyle. If you have a medical condition, take medication, or are pregnant or breastfeeding, please speak to your GP or pharmacist before starting any new supplement.

A quick note

This article is general information, not medical or nutritional advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and should not be used to prevent or treat any illness. Always read the product label, do your own research, and speak to a qualified doctor, pharmacist or registered nutritionist before starting a new supplement — especially if you are pregnant, breastfeeding, under 18, taking medication or managing a health condition.