Of all the reasons people take fish oil, the heart is the most established — and the one backed by an authorised claim. So what makes the best fish oil for heart health, and how do you avoid the underdosed products that dominate the shelves? Here's a straight guide.
For transparency: the authorised claim is that EPA and DHA contribute to the normal function of the heart, at a daily intake of 250mg. That's the basis for this article. Nothing here should be read as a claim that fish oil treats or prevents heart disease — supporting normal function and treating disease are very different things.
The claim, stated precisely
EPA and DHA — the two long-chain omega-3 fatty acids from oily fish — contribute to the normal function of the heart, with the beneficial effect obtained at a daily intake of 250mg of EPA and DHA combined. That 250mg figure is the number to remember: it's the threshold the authorised claim is built on, and it's the bar a fish oil needs to clear to genuinely support the claim.
The underdosing trap
Here's where most fish oils fall down. A bottle might shout "1,000mg fish oil" on the front — but fish oil is not the same as EPA and DHA. That 1,000mg might contain only 180mg EPA and 120mg DHA, with the rest being other fats. Always turn the bottle over and read the EPA and DHA figures specifically. If they're not clearly stated, that's usually a sign they're low.
What the best fish oil for heart health looks like
- Clearly stated EPA and DHA — not just "total omega-3" or "fish oil weight".
- Comfortably above 250mg combined — ideally well above, so a sensible serving clears the threshold easily.
- Tested for purity — oily fish can concentrate contaminants, so heavy-metal testing matters. Ours is tested for purity and heavy metals at a GMP-certified facility.
- Fresh, not rancid — omega-3 oils oxidise; a clean softgel with no strong fishy taste is a good practical indicator.
How much, and how to take it
For the heart claim, 250mg of EPA and DHA daily is the established threshold — though many people take more. Take it with a meal containing some fat, which helps absorption. Consistency matters more than timing. Our High-Strength Omega-3 Fish Oil delivers 1,040mg EPA and 692mg DHA per serving — far above the threshold, so the heart claim is met with considerable room to spare.
Where it fits in the bigger picture
Omega-3's heart role is one of three authorised roles — the others being brain and vision (both via DHA), which we cover in the main guide to omega-3 for heart and brain health. For most people, a single quality fish oil covers all three at once.
The takeaway
The best fish oil for heart health isn't the one with the biggest number on the front — it's the one with the highest clearly-stated EPA and DHA, comfortably above 250mg, tested for purity. Read the back of the bottle. Our High-Strength Omega-3 is built to those numbers.
Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or managing a medical condition, speak to your GP or pharmacist before starting a new supplement. Contains fish. Signed, Dr. Miron, Founder of Pure Vitamins UK.
