Fish Oil (Omega-3)

All Supplements

Evidence summary

Fish Oil (Omega-3) has strong evidence in this guide. The reference dose is 1-3g EPA/DHA combined daily, with timing listed as with a meal containing fat. Supplements should support a sound diet and training plan, not replace them.

• Reduces inflammation
• Supports joint health

What Is Fish Oil?

Fish oil supplements provide omega-3 fatty acids, primarily EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). These essential fats play critical roles in managing inflammation, supporting brain and heart health, and aiding recovery from exercise. Your body cannot produce them, so they must come from your diet or supplements.

How It Works

EPA is the anti-inflammatory powerhouse. It competes with omega-6 fatty acids (abundant in modern diets) for the same enzymatic pathways, reducing the production of pro-inflammatory compounds. DHA is concentrated in the brain and retina, supporting cognitive function and eye health. Together, they help shift your body’s inflammatory balance towards recovery.

What the Research Says

Fish oil has strong evidence for reducing markers of inflammation and supporting cardiovascular health. For athletes, studies show it may reduce delayed-onset muscle soreness (DOMS) and support joint health — particularly beneficial for those doing heavy or high-volume training. The evidence for heart health benefits is well-established, though recent large trials have shown mixed results for people already eating a healthy diet.

Dose Matters — Read the Label

The total fish oil per capsule is not the same as the EPA/DHA content. A 1000mg fish oil capsule might only contain 300mg of combined EPA/DHA. You want 1-3g of EPA and DHA combined, not 1-3g of fish oil. Always flip the bottle and read the breakdown.

Who Should Take It

Anyone who does not regularly eat oily fish (salmon, mackerel, sardines) 2-3 times per week. If your diet is high in omega-6 (processed foods, vegetable oils) and low in omega-3, supplementation can help restore the balance. Particularly useful for lifters dealing with joint discomfort.

Who Should Avoid It

People on blood-thinning medications should consult their doctor, as fish oil has mild anticoagulant effects. If you are allergic to fish, avoid it entirely and opt for algae-based omega-3 instead.

Vegan?

Fish oil is not vegan — it is derived from fatty fish. The good news is that algae-based omega-3 supplements provide the same EPA and DHA, sourced from the microalgae that fish themselves eat. Algae oil is the recommended vegan alternative and is equally effective.

Where to Buy

• Myprotein Omega 3 — from £7.99
• Bulk Fish Oil Softgels — from £6.99
• Amazon — Nordic Oil Omega-3 — from £12.99

Fish Oil (Omega-3): common questions

What is fish oil (omega-3) used for?

Fish Oil (Omega-3) is commonly considered for reduces inflammation, supports joint health, may improve heart health, supports brain function, may reduce muscle soreness. The evidence rating in this guide is strong.

When should I take fish oil (omega-3)?

The practical timing used in this guide is with a meal containing fat. Consistency and the total daily dose are often more important than a narrow timing window.

How much fish oil (omega-3) should I take?

The reference dosage in this guide is 1-3g EPA/DHA combined daily. Individual needs vary, so check the product label and speak to a qualified healthcare professional if you have a medical condition, take medication, are pregnant, or are unsure.

Is fish oil (omega-3) vegan friendly?

Not every fish oil (omega-3) product is vegan friendly. Check the source, capsule material, flavouring, and allergen information on the specific product.

Affiliate disclosure: some links on this page are affiliate links. We earn a small commission at no extra cost to you.