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Do I need an Omega-3 Supplement, and How do I Know Which One to Choose?

So you have heard that you should be including something along the lines of Omega 3, fish oil, EPA or polyunsaturated thingybobs in your diet, but not entirely sure what you’re doing, and looking for a supplement can be overwhelming. We can help.

So, what are Omega-3s?

They are polyunsaturated fats and come in several forms such as eicosapentaenoic acid (EPA) docosahexaenoic acid (DHA) and alpha-linolenic acid (ALA).

EPA and DHA are longer fatty acid chains, whereas ALA is a shorter chain.

These are the three main Omega-3 fatty acids which play an important role in the human body and should be included in our diets.

Where are they found?

They can be found in fish oils, but also plant oils, seeds and nuts.

EPA and DHA are commonly found in oily fish such as kippers, pilchards, trout, sprats, salmon, herring, sardines, crab (fresh) and whitebait. They can also be found in meat, eggs and dairy from grass-fed animals, but in smaller amounts.

ALA, on the other hand, is found in plant oils such as flaxseed oil, and can also be found in other plant based foods such as walnuts and soybean products.

What’s the difference between the three?

They are all long fatty acid chains with more than one double bond. This is where the ‘poly’ comes from in ‘polyunsaturated fat’, meaning more than one. Omega-3 and Omega-6 are both polyunsaturated fats, but it's important to have the right ratio of these fatty acids in the diet as currently as a population we are having too much Omega-6 and too little Omega-3!

You may have also heard of monounsaturated fats (Omega-9), and these only have one double bond ‘mono’. But let’s go back to Omega-3 before things get confusing.

ALA is the most common Omega-3 fatty acid out of the three discussed, however DHA is the most important. ALA can be converted to EPA and DHA but the efficiency is very low, and our body is less able to do this as we get older.

So, although it’s great to include good sources of ALA (so plant oils, nuts, seeds) in your diet, getting your Omega-3 from oily fish in the EPA/DHA form is much better!

What are the health benefits?

Omega-3s are important for your heart, blood vessels, lungs and the immune and hormone systems and a key structural component of your brain, the retina, sperm and many other body parts.

Furthermore, Omega-3 fatty acids also have anti-inflammatory and antioxidant benefits and are linked with reducing the risk of dementia, improving fertility, and important for the development of a baby’s brain, plus so much more.

How much should we have?

The UK has no recommended daily intake of Omega-3s so how much we should be having isn’t really known. However, the current recommendation is to have 2 portions of fish a week, with one of these being oily and said to provide around 450mg of EPA and DHA. According to the BDA, we should be looking for supplements that provide us with about 450mg combined EPA and DHA per daily adult dose.

However, the US Food and Drug Association (FDA) and The EU Food Safety Authority (EFSA) have recommended upper limits of 3000mg and 5000mg a day, respectively. Higher intakes can cause blood thinning and bleeding amongst other serious issues, so do not exceed and consult with GP before you start taking them.

How to choose the right supplement for you?

Humans are not able to produce these essential fatty acids themselves, so it is crucial to include them in your diet by eating oily fish or making sure we top up our Omega-3 intake with a food supplement. When there are so many supplements on the shelves, it can be difficult to know what’s best for you! So here are some things to look out for.

Check label for EPA/ DHA content

Fish oil is an oil that is produced by the fish's fat and tissues that contains the Omega-3 fatty acids (DHA & EPA) that we are really looking out for, however, it also contains other elements besides Omega-3.

Generally, it contains about 30% of pure Omega-3 fatty acids, however, when it comes to fish oils that are used as food supplements, the concentration can vary from 8% to 80%.

So first of all you need to check the label and look to see how much EPA and DHA is in the recommended dosage. You’ll find that the cheaper fish oil/Omega-3 supplements will have significantly less than the pricier ones, and this is why - but shop around!

Here's a list of a few supplements available (vegan and non vegan) and the Omega-3 content, cost, number of capsules and how many are recommended a day. You can see that the cheaper one actually doesn't state the EPA/DHA content. Some vegan Omega-3 supplements only contain ALA too.



Total Fish Oil

Total Omega-3

Total EPA

Total DHA

Seven seas Omega - 3

Max Strength

30 capsules


1 Capsule per day

(30 days worth)






Super strength Omega-3 fish Oil

120 capsules


2 Capsules per day

(60 days worth)


Doesn't state



Holland and Barrett Omega-3 Fish Oil 360 capsules £24.99

1 Capsule per day (360 days worth)






High strength Omega-3 fish oil

90 capsules


1 Capsule per day (90 days worth)


Doesn't state

Doesn't state

Doesn't state

Holland and Barrett

High Strength

Triple Omega 3-6-9


30 capsules


1 Capsule per day (30 days worth)


Doesn't state




Omega-3 Oil


60 Capsules


1 Capsule per day (60 days worth)


450mg (ALA)



Together Natural Algae DHA Omega 3

30 Softgels


1 Capsule per day (30 days worth)





Ensure they are suitable for your diet

As we have mentioned, the type of Omega-3 that comes from fish oils (EPA & DHA) is more readily available than those that come from plants (ALA’s).

However, fish themselves don’t actually produce the Omega-3. Instead, they acquire it from eating phytoplankton which absorbs microalgae and this is the main source.

So the best Omega-3 supplements for vegans or vegetarians is from algae instead of other plant oils that will only have ALA.

Also ensure the capsule casing itself is vegan.

Check the Vitamin A content

Many supplements contain vitamin A, however as it is a fat soluble vitamin, your body stores it and too much vitamin A can be toxic to the body. You should not have more than a total of 1.5mg vitamin A (1500ug) a day from food and supplements combined, according to the British Dietetic Association, so if you are getting vitamin A from other supplements then it’s best to avoid omega-3 supplements with this vitamin added.

This is particularly important if you are pregnant or trying for a baby. Any supplement containing vitamin A should be avoided during this time as it can harm your unborn baby. You should also avoid fish liver oil for this reason.

Still unsure? Get in touch so we can help you optimise your diet.

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