Free UK delivery for orders over £35
●
Easy 30-day returns
●
10% off with monthly subscription
●
Pure Vitamins UK High-Strength Omega-3 Fish Oil softgel bottle for heart health with EPA and DHA

Best Fish Oil for Heart Health: What to Look For

by Dr. Miron in News

Reviewed and updated: 23 July 2026

Best fish oil for heart health: what to look for

The best fish oil for heart health is the one with the highest clearly stated EPA and DHA per serving, comfortably above 250 mg combined, in a well-absorbed form and tested for purity, rather than the one with the biggest number on the front of the bottle. That is the short answer, and I say it because EPA and DHA, the two long-chain omega-3s from oily fish, genuinely contribute to the normal function of the heart, yet a lot of shelf products quietly fall short of the amount that matters. Below I will show you how to read a fish oil label the way I do.

Pure Vitamins UK High-Strength Omega-3 Fish Oil, 1732mg omega-3 per serving, 60 softgel capsules, GMP-certified

TL;DR

  • What it is: concentrated EPA and DHA, the long-chain omega-3 fats from oily fish, in an easy daily softgel.
  • Who it is for: adults who do not eat oily fish a couple of times a week and want a reliable omega-3 top-up. It contains fish, so it is not for a fish allergy or a vegan diet (algae is the plant-based route).
  • The one thing to know: EPA and DHA contribute to the normal function of the heart, with the beneficial effect from 250 mg a day. Read the EPA and DHA figures on the back, not the fish-oil weight on the front.

The number that matters: 250 mg of EPA and DHA

EPA and DHA contribute to the normal function of the heart, with the beneficial effect obtained at a daily intake of 250 mg of EPA and DHA combined. That 250 mg figure is the one to keep in your head: it is the bar a fish oil needs to clear comfortably. Most well-made products should reach it in a single serving with room to spare, and if you cannot see the EPA and DHA numbers to check, that in itself tells you something.

The underdosing trap: fish oil weight is not EPA and DHA

This is where most fish oils fall down, and it is my number-one tip. A bottle might shout 1,000 mg fish oil on the front, but fish oil weight is not the same as EPA and DHA. That 1,000 mg might contain only around 180 mg EPA and 120 mg DHA, with the rest being other fats. Always turn the bottle over and read the EPA and DHA figures specifically, per serving. If a product states only total omega-3 or fish oil and hides the EPA and DHA split, that is usually a sign the active amounts are low.

EPA and DHA: what each one is

EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are the two long-chain omega-3s your body puts to work. For the heart, what counts is the combined EPA and DHA reaching 250 mg a day. DHA also does extra duty: DHA contributes to the maintenance of normal brain function and to the maintenance of normal vision, each at a daily intake of 250 mg of DHA. Interestingly, the two are not identical in the body. According to research retrieved from PubMed, a randomised controlled trial in young healthy adults found that DHA lowered blood triglycerides while EPA did not, pointing to genuinely different metabolic roles for the two fats (Klingel et al., 2019, DOI). I break down the ratio and amounts in EPA vs DHA: how much omega-3.

Pure Vitamins UK Omega-3 Fish Oil softgels showing high-strength EPA and DHA, 1732mg omega-3 per serving

Form and absorption: triglyceride vs ethyl ester

The chemical form of the oil affects how well it is absorbed, which is a genuine quality consideration. According to research retrieved from PubMed, a randomised, double-blind trial in 150 healthy volunteers found that identical doses of EPA and DHA raised the omega-3 index (the proportion of EPA and DHA in red blood cell membranes) faster and to a greater extent when taken as re-esterified triacylglycerides than as ethyl esters over six months (Neubronner et al., 2011, DOI). The practical takeaway is to favour a well-formulated oil and to take it with food, rather than judging a product on its front-of-pack number alone.

Pure Vitamins UK High-Strength Omega-3 Fish Oil capsules, EPA and DHA, 1732mg per serving

Purity and freshness

Oily fish can concentrate contaminants from the sea, so heavy-metal testing genuinely matters for a fish oil. Omega-3 oils also oxidise over time, and a rancid oil is both unpleasant and lower quality, so freshness counts too. A clean softgel with no strong fishy aftertaste is a reasonable everyday indicator. Our omega-3 is tested for purity and heavy metals at our GMP-certified facility, with a Certificate of Analysis available on request.

How much, and how to take it

For the heart, 250 mg of EPA and DHA combined per day is the established threshold, though many people choose to take more. Take it with a meal that contains some fat, which supports absorption, and be consistent, since steady daily intake matters more than the time of day. Our High-Strength Omega-3 Fish Oil provides 1,732 mg of omega-3 per serving, with EPA and DHA well above the 250 mg threshold, so you clear that bar comfortably in one serving.

Pure Vitamins UK Omega-3 Fish Oil nutritional panel showing 1040mg EPA and 692mg DHA per serving

Fish oil or algae?

Fish oil is the traditional source of EPA and DHA, but algae-derived omega-3 is the plant-based route for vegans and vegetarians, since the fish ultimately get their omega-3 from algae in the first place. If you avoid fish, an algae omega-3 is the option to look at, and I compare the two, plus when to take omega-3, in fish oil vs algae omega-3. There is also an honest look at the vision research in omega-3 and dry eyes.

A few cautions worth knowing

Omega-3 fish oil is well tolerated by most people. It contains fish, so it is not suitable if you have a fish allergy. If you take blood-thinning medication such as warfarin, are pregnant or breastfeeding, or are managing a medical condition, speak to your GP or pharmacist before starting a fish oil. As with any supplement, follow the serving on the label rather than assuming more is automatically better.

An honest checklist for choosing

  • Clearly stated EPA and DHA per serving, not just total omega-3 or fish oil weight.
  • Combined EPA and DHA comfortably above 250 mg, ideally well above so a sensible serving clears the threshold easily.
  • A well-absorbed, well-formulated oil, taken with food.
  • Tested for purity and heavy metals, with freshness you can taste (no strong rancid aftertaste).
  • A source that suits your diet: fish oil, or algae omega-3 if plant-based.

What to realistically expect

Omega-3 is a steady, everyday supplement rather than something you feel overnight. Its value is in consistent daily intake of enough EPA and DHA, which is exactly why the label numbers matter more than the marketing. Choose a product that clears the threshold comfortably, take it with food, and keep it up.

Where Pure Vitamins fits

Our High-Strength Omega-3 Fish Oil is built to these numbers: 1,732 mg of omega-3 per serving with EPA and DHA well above the 250 mg threshold, in softgels, tested for purity and heavy metals at our GMP-certified facility. EPA and DHA contribute to the normal function of the heart, and DHA contributes to the maintenance of normal brain function and normal vision. For the fuller picture of omega-3's roles, see omega-3 for heart and brain health, and browse the wider range on our Pure Vitamins UK home page.

View High-Strength Omega-3

Frequently asked questions

How much EPA and DHA do I need for the heart? EPA and DHA contribute to the normal function of the heart, with the beneficial effect obtained at a daily intake of 250 mg combined.

Why is 1,000 mg fish oil misleading? Fish oil weight is not the same as EPA and DHA. A large fish-oil number can contain only a small amount of the active EPA and DHA, so read the back-of-pack figures.

Does the form of fish oil matter? Form affects absorption. Research in healthy volunteers found the triglyceride form raised the omega-3 index more than the ethyl ester form. Taking fish oil with food also helps.

Is there a vegan option? Yes, algae-derived omega-3 provides EPA and DHA without fish.

When should I take it? With a meal containing some fat, consistently. Time of day is less important than taking it regularly.

Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. Contains fish. If you are pregnant, breastfeeding, taking medication or managing a medical condition, speak to your GP or pharmacist before starting a new supplement.

Dr. Miron, Founder of Pure Vitamins UK.

Related articles

Tags: DHA EPA EPA DHA Fish Oil Heart Health Omega-3 Purity Tests Supplements Vegan Omega-3
Previous Post Next Post

Related Posts

High-strength biotin 10,000 mcg tablets for hair and skin by Pure Vitamins UK

Which is better, B12 or biotin?

Reviewed and updated: 28 July 2026 If you are asking which is better, B12 or biotin, the honest answer is that neither one wins, because they are not really competing for the same job. Vitamin B12 and biotin are both B vitamins, but they look after different parts of your body, so the right question is not which is stronger, it is which one fits what you are trying to support, and whether you might actually benefit from both. B12 or biotin: the short version I am Dr. Miron, Founder of Pure Vitamins UK, and this is the comparison I get asked about more than almost any other. People see biotin marketed for hair and B12 marketed for energy, assume they overlap, and try to pick a winner. They do not overlap much at all. Biotin is best known for its role in maintaining normal hair and skin, while B12 is the one your body leans on for normal red blood cell formation, a normal nervous system, and reducing tiredness and fatigue. Choose based on your goal, not on which sounds more powerful. The quick answer, at a glance What they are: both are water-soluble B vitamins your body cannot store in large amounts, so a steady daily intake matters. Reach for biotin if: your focus is hair and skin, or you want support for normal energy-yielding metabolism and macronutrient metabolism. Reach for B12 if: your focus is everyday energy, the nervous system and red blood cells, especially if you eat little or no animal food. Can you take both? Yes. They are complementary B vitamins with no reason to compete, and many people sensibly take both. The one catch: very high-strength biotin can interfere with some blood tests, so mention it to whoever takes your bloods. What biotin actually does Biotin, sometimes called vitamin B7, is a coenzyme your body uses to help turn the food you eat into usable energy. In the language of the GB nutrition and health claims register, biotin contributes to normal macronutrient metabolism, normal energy-yielding metabolism, the normal functioning of the nervous system, normal psychological function, and the maintenance of normal hair and normal skin. That hair and skin role is exactly why biotin ended up on every beauty shelf. Here is the part the marketing tends to skip. The research on biotin for hair is genuinely useful, but it is honest about its limits. A systematic review of biotin for hair loss found that improvement was seen in people who had an underlying biotin deficiency or a specific condition, and concluded there is a lack of good evidence that supplementing helps people who are not deficient (Patel, Swink and Castelo-Soccio, 2017, https://doi.org/10.1159/000462981). A broader review of vitamins and minerals in hair loss reached a similar view, that micronutrients matter most when a deficiency is present (Almohanna and colleagues, 2019, https://doi.org/10.1007/s13555-018-0278-6). So biotin is a sensible daily nutrient for hair and skin maintenance, not a guaranteed hair-growth switch. One small point of accuracy worth knowing: the authorised claim in the UK links biotin to normal hair and skin, while it is actually zinc that carries the authorised claim for the maintenance of normal nails, which is why our hair, skin and nails thinking usually pairs the two. You can read more on that in our guide to what actually supports normal nails. What vitamin B12 actually does Vitamin B12, or cobalamin, does heavier lifting across the body. It contributes to normal energy-yielding metabolism, the normal functioning of the nervous system, normal red blood cell formation, normal homocysteine metabolism, normal psychological function, and the reduction of tiredness and fatigue. In plain terms, it is central to making healthy red blood cells, keeping nerves working properly, and supporting steady everyday energy. B12 also has a well-documented deficiency story, which is really a story about biology rather than any product. B12 has an important role in DNA synthesis, methylation and cellular metabolism, and deficiency can produce both blood and neurological effects if it is missed for a long time (Green and colleagues, 2017, https://doi.org/10.1038/nrdp.2017.40). Because the body mostly gets B12 from animal foods, people following vegan or vegetarian diets, older adults, and anyone with absorption problems are more likely to run low, and clinical guidance stresses paying attention to symptoms alongside blood markers (Obeid and colleagues, 2024, https://doi.org/10.3390/jcm13082176). If you eat little or no animal food, this is the one I would look at first, and our full vitamin B12 UK guide goes deeper on who is most at risk. So which is better, B12 or biotin? The most useful way to answer which is better, B12 or biotin, is to stop ranking them and match each to a goal. If your interest is hair and skin, biotin is the more relevant nutrient. If your interest is energy that comes from healthy blood and nerves, or you are worried about a dietary gap, B12 is the more relevant one. Neither is a stronger version of the other, and picking the wrong one for your goal is the only real mistake here. A few honest scenarios help: You want to support your hair and skin routine: biotin is the natural fit, ideally alongside a varied diet. See our honest take on biotin versus collagen for beauty if you are weighing those two as well. You feel persistently tired and eat little animal food: B12 is the more logical starting point, and worth a conversation with your GP. You are covering general nutrition: both appear together in most B-complex and multivitamin formulas for good reason, and you can read how we think about that in our best vitamins for hair, skin and nails guide and the wider supplement guides hub. Can you take B12 and biotin together? Yes, and there is no clash. They are both B vitamins, they act on different pathways, and neither blocks the other. Plenty of people take a dedicated biotin for hair and skin and a separate B12 for energy and dietary cover, or simply take a B-complex that includes both. If you prefer to keep things targeted, you can pair our high-strength biotin tablets with a vitamin B12 supplement and take them at whatever time suits your routine, since consistency matters far more than timing. How much of each do you need? For labelling in the UK, the nutrient reference value, or NRV, is 50 micrograms for biotin and 2.5 micrograms for B12. Those NRVs are the baseline a normal diet aims to cover, not a ceiling. Everyday adequate intakes are modest: EFSA sets an adequate intake for biotin around 40 micrograms a day, and the UK reference nutrient intake for B12 is roughly 1.5 micrograms a day for adults. Supplements often sit well above those figures, which is normal for water-soluble B vitamins. A 10,000 microgram biotin tablet, for example, provides a very high multiple of the NRV, and a B12 supplement is frequently dosed high to account for the fact that only a fraction is absorbed at once. Neither biotin nor B12 has a formal tolerable upper intake level set, largely because they are water-soluble and surplus amounts are mostly excreted rather than stored. That does not mean more is automatically better, and for biotin in particular there is a specific reason to be thoughtful about very high doses, which I will come to next. If you want the detail on strengths, our guide to how much biotin you actually need lays it out. The one thing to know before a blood test This is the part most hair-and-energy articles leave out, and it genuinely matters. High-strength biotin can interfere with some laboratory blood tests. Many common tests use biotin-based technology, and when there is a lot of biotin in your bloodstream it can push certain results falsely high or falsely low. A review of this problem lists thyroid tests, troponin (a heart marker), and hormone and vitamin tests among those that can be affected, and notes the interference tends to appear at higher intakes (Moerman and Delanghe, 2020, https://doi.org/10.1080/17843286.2020.1780770). The practical takeaway is simple and reassuring. If you take a high-strength biotin, tell whoever is arranging your blood tests, and it is commonly suggested to pause biotin for a couple of days beforehand so your results are read accurately. This is also a neat reason the two vitamins connect: biotin can distort some of the very markers used around B12 and thyroid testing, so honesty with your clinician keeps the picture clean. Signs your levels might be low Frank biotin deficiency is uncommon in people eating a normal varied diet, because biotin is widespread in food and also made by gut bacteria. When it does occur it can show up as thinning hair, skin changes and brittleness. B12 shortfall is more common, especially with a plant-based diet or with age, and can show as unusual tiredness, a pale or washed-out look, pins and needles, or low mood. None of this is something to self-assess from a blog, so if symptoms are persistent, a GP and a blood test are the sensible route. Where to get them from food Food first is always my starting point. Biotin is found in eggs (especially the yolk), nuts, seeds, oily fish, sweet potatoes and wholegrains. B12 is almost entirely found in animal foods such as meat, fish, eggs and dairy, plus fortified foods like some plant milks and breakfast cereals. That single difference explains a lot: it is much easier to fall short on B12 on a vegan diet than on biotin, which is one of the clearest cases where a supplement earns its place. How to choose and take them well When you are comparing products, look past the front of the label. For B12, the form matters to some people, which is why we use methylcobalamin and adenosylcobalamin, the body-ready forms, in our B12; you can read the differences in our explainer on B12 forms. For biotin, the useful details are the actual microgram strength and the NRV percentage, so you know exactly what you are getting. Both of ours are formulated in the UK and tested for purity and heavy metals at our GMP-certified facility, which is the standard I would want as a buyer. On timing, do not overthink it. Both are water-soluble, so take them with a little food if that helps you remember, keep it daily, and let consistency do the work. If you like a tidy routine, the whole point of our Pure Vitamins range is that you can build exactly the stack your goals call for. What to realistically expect Set expectations kindly. If you are genuinely low in a nutrient, correcting that gap can make a real difference over weeks to months. If your levels are already fine, topping up further is unlikely to transform anything, and that is true for both biotin and B12. Supplements support a good diet and lifestyle, they do not replace them, and the most honest promise any brand can make is a clean, well-labelled product that helps you cover your bases. A few cautions worth knowing If you are pregnant, breastfeeding, or managing a health condition, check with a healthcare professional before starting a new high-strength supplement. Tell whoever arranges your blood tests that you take biotin, as high-strength biotin can affect some results. Persistent tiredness, tingling or hair changes deserve a proper look from your GP rather than guesswork. Stick to the stated dose on the label unless a professional advises otherwise. Frequently asked questions Is B12 or biotin better for energy? For energy specifically, B12 is the more relevant of the two, because it contributes to normal energy-yielding metabolism and the reduction of tiredness and fatigue, and it is central to red blood cell formation. Biotin also contributes to normal energy-yielding metabolism, but it is better known for hair and skin. Is B12 or biotin better for hair? Biotin is the one associated with the maintenance of normal hair. That said, the research shows the clearest benefit in people who are actually low in biotin, so it supports a hair routine rather than guaranteeing regrowth. Can I take B12 and biotin at the same time? Yes. They are complementary B vitamins with no interaction to worry about, and many people take both, either as separate supplements or within a B-complex or multivitamin. Does biotin really affect blood tests? High-strength biotin can interfere with some laboratory immunoassays and shift certain results, so it is best to tell your clinician you take it and, where advised, pause it for a day or two before testing. Which should I choose if I am vegan? B12 is usually the priority for anyone on a vegan or largely plant-based diet, because it is found almost entirely in animal foods. Biotin is more widely available from plant foods, so shortfalls are less common. Shop High-Strength Biotin Tablets Warmly,Dr. Miron, Founder of Pure Vitamins UK This article is for general information and education. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and this is not medical advice. If you have symptoms or a health condition, speak to your GP or a qualified healthcare professional.

Learn more

Does creatine burn belly fat?

Does creatine burn belly fat? No. An honest UK look at what the peer-reviewed research shows about creatine, body fat and why the scales can rise at first.

Learn more
Pure Vitamins UK micronised creatine monohydrate powder jar with 5g dose for muscle water retention and weight gain explanation

Why did I gain 10 pounds after taking creatine?

Gained weight on creatine? It is almost always water drawn into your muscle cells, not fat. A UK guide to what the research found and how to manage it.

Learn more
Secure_checkout-Pure Vitamins
Certification__Awards-Pure Vitamins
30-Day_Money-Back_Guarantee-Pure Vitamins
Home Search Cart Products About