How much omega-3 should I take daily?

For most healthy UK adults, 1,000-2,000 mg combined EPA+DHA per day is the maintenance dose. Higher doses (2,000-4,000 mg EPA+DHA) are used for specific goals like cardiovascular support or mood.

What's better: fish oil, krill oil, or algae?

All three work. Fish oil (TG form) is the most cost-effective. Krill oil is more bioavailable per gram but more expensive. Algal oil is the vegan choice — sustainable and well-absorbed.

Should I take omega-3 with food?

Yes — omega-3 is fat-soluble, so absorption is much better when taken with a meal containing fat. Taking fish oil on an empty stomach can cause 'fish burps' — taking it with food dramatically reduces this.

Is omega-3 safe during pregnancy?

Yes — omega-3 (especially DHA) is recommended during pregnancy and breastfeeding. Look for prenatal-specific formulations with at least 200-300 mg DHA. Avoid high-dose vitamin A products (like cod liver oil) during pregnancy — choose a pure omega-3 instead.

Can I get enough omega-3 from food alone?

If you eat two portions of oily fish per week (salmon, mackerel, sardines, anchovies, herring), you likely don't need to supplement. Most UK adults don't meet this target, making supplementation the practical option.

Does fish oil need to be refrigerated?

Not strictly necessary, but storage in a cool, dark place (away from direct sunlight and heat) extends shelf life and reduces oxidation. Some UK formulations include vitamin E as an antioxidant to prevent rancidity.

Omega-3 UK Guide: EPA, DHA, Forms & Top Products

Last updated: 2026-08-31 · by Sun Supplements

UK diets are typically omega-3 deficient. This guide explains the difference between EPA and DHA, fish oil vs krill oil vs algae, why TG-form matters, how much to take, and the best UK products for cardiovascular, brain, and mood support.

Why omega-3 matters for UK adults

The UK population is, on average, omega-3 deficient. The UK diet is heavy in omega-6 (from vegetable oils, processed foods, and grain-fed meat) and light in omega-3 (from oily fish). The ideal omega-6 to omega-3 ratio is around 4:1; the typical UK ratio is estimated at 15-20:1. This imbalance drives chronic inflammation and is linked to cardiovascular disease, joint pain, mood disorders, and cognitive decline.

Omega-3 supplementation supports:

Heart health — triglyceride reduction, blood pressure support, anti-inflammatory effects
Brain and cognitive function — DHA is a major structural fat in the brain; low DHA is linked to cognitive decline
Mood and mental health — clinical trials support omega-3 for mood support, particularly high-EPA formulas
Joint health — anti-inflammatory effects may reduce joint stiffness and pain
Eye health — DHA is a major structural fat in the retina
Prenatal and infant development — DHA is critical for fetal brain and eye development

The NHS recommends eating two portions of oily fish per week. For UK buyers who don't eat oily fish regularly, omega-3 supplementation is the practical alternative.

EPA vs DHA explained

Omega-3 supplements contain two key long-chain fatty acids: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). They have different roles:

EPA — primarily anti-inflammatory. Best for mood support, joint health, cardiovascular benefits.
DHA — primarily structural. Critical for brain, eye, and nervous system health. Most important during pregnancy and infancy.

Most UK formulations combine both. The exact ratio matters:

High-EPA (1,000+ mg EPA, <500 mg DHA) — best for mood and inflammation
High-DHA (500+ mg DHA, <500 mg EPA) — best for brain, eyes, pregnancy
Balanced (similar EPA and DHA) — general cardiovascular and brain health

Look at the EPA+DHA content on the label, not just the fish oil weight. A "1,000 mg fish oil" capsule often contains only 300 mg of EPA+DHA combined.

Fish oil vs krill oil vs algae

Three main sources of omega-3:

Fish oil (most common)

Standard, well-priced, widely available. Comes in two forms: triglyceride (TG) and ethyl ester (EE). TG is more bioavailable — see next section.

Krill oil (premium)

Sourced from Antarctic krill. Contains omega-3 bound to phospholipids (better absorbed than fish oil) and naturally high in astaxanthin (an antioxidant). More expensive than fish oil. Some published evidence supports lower-dose efficacy due to better absorption.

Algal oil (vegan)

Sourced from algae. Provides DHA (and some EPA in newer formulations) without fish. The original source of omega-3 in the marine food chain. Excellent choice for vegan UK buyers — well-absorbed and sustainable.

TG form vs EE form

Fish oils come in two chemical forms:

Triglyceride (TG) form — the natural form, found in fish. Better absorbed (estimated 70% more bioavailable than EE). More expensive to produce. Look for "TG" or "triglyceride form" on the label.
Ethyl ester (EE) form — the concentrated form used in cheaper fish oils. Less well absorbed. Often requires higher doses for equivalent effect.

For UK buyers, TG-form fish oil is the gold standard. Cheaper EE-form fish oils still work but require higher doses for the same effect. Premium brands like Carlson, Life Extension, and Solgar sell TG-form products.

How much omega-3 you need

General UK recommendations for combined EPA+DHA intake:

Healthy adults (maintenance): 1,000-2,000 mg EPA+DHA per day
Cardiovascular support (high triglycerides): 2,000-4,000 mg EPA+DHA per day
Mood support: 2,000+ mg EPA per day (high-EPA formula)
Prenatal: 200-300 mg DHA per day (look for prenatal-specific formulations)
Children: 250-500 mg EPA+DHA per day

Most UK fish oil products deliver 300-1,000 mg EPA+DHA per softgel, so typical daily intake is 2-3 softgels.

Top UK products

Life Extension Super Omega-3 (TG form) — 120 softgels, 1,400 mg EPA+DHA per serving. Premium TG form.
Carlson Super Omega-3 (TG form) — IFOS 5-star certified, sustainably sourced. 60-200 softgel sizes.
California Gold Nutrition Omega-3 Premium Fish Oil — 100 softgels, 1,000 mg EPA+DHA, TG form, value tier.
Natural Factors Whole Earth & Sea Vegan Omega-3 — algae-derived EPA+DHA, 60 softgels, vegan.
Carlson Cod Liver Oil (Lemon) — liquid form with naturally occurring vitamins A and D. 250 ml.

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Omega-3 UK Guide 2026: EPA vs DHA, Top Products