Which Omega-3 Should You Buy? The Buyer's Guide

Two omega-3 products, the same "1000 mg" on the front - and yet one delivers four times as much active ingredient as the other. How can that be? Because the big number almost always refers to the amount of oil, not the effective fatty acids. Short and to the point: when buying omega-3, look at the EPA and DHA content per serving (not the amount of oil) as well as purity and freshness. Those who rarely eat fish benefit most; for vegans, algae oil is the obvious choice. For omega-3 there are clear, EU-approved statements - and you'll know them word for word in a moment.

The Key Points at a Glance

• DHA contributes to the maintenance of normal brain function and normal vision (from 250 mg DHA/day).
• EPA and DHA contribute to the normal function of the heart (from 250 mg EPA+DHA/day) - EU-approved.
• What matters for your purchase is the EPA/DHA content per serving, not the pure amount of oil.
• Vegan: algae oil delivers EPA and DHA directly from microalgae, without any fishy taste.
• Quality markers: purity (low contaminants), freshness (low oxidation value/TOTOX), lab testing.

Briefly Explained: EPA, DHA and ALA - and What They Do in the Body

"Omega-3" is an umbrella term. For the approved statements, what counts are the two long-chain fatty acids EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). DHA is a structural building block of cell membranes and is especially concentrated in the brain and retina - which is precisely why the statements concern brain function and vision of all things. EPA and DHA are found above all in fatty sea fish (salmon, mackerel, herring) and in microalgae, the original source from which the fish absorb them through the food chain. The plant-based precursor ALA (from linseed, rapeseed and walnut oil) is converted by the body into EPA and DHA only to a small extent. That is why the purchasing question is not "how much oil" but "how much EPA and DHA". The ratio is explained in EPA & DHA: the ratio, and your status in the omega-3 index.

The Approved Statements in Plain Language

Unlike many plant compounds, omega-3 has clear, EU-approved statements - tied to daily amounts that you may confidently keep in mind:

• DHA contributes to the maintenance of normal brain function - at 250 mg DHA/day.
• DHA contributes to the maintenance of normal vision - at 250 mg DHA/day.
• EPA and DHA contribute to the normal function of the heart - at 250 mg EPA+DHA/day.

These thresholds are the reason why the EPA/DHA content per serving matters so much: only once a product realistically reaches the 250 mg do the statements apply. A cheap oil with little EPA/DHA per capsule forces you to take many capsules - and is then often no longer cheap.

What Research Is Investigating

The role of EPA and DHA in heart function, brain function and vision is so well established that the EU has approved statements for it - that is not a footnote but a recognised foundation. Beyond that, research has been studying omega-3 for decades in many contexts, for instance around the supply for people who don't eat fish, or the ratio of omega-3 to omega-6 in the modern diet. One active branch of research deals with the omega-3 index as a marker of supply. Much of this is ongoing science and not a product promise - the approved statements on heart, brain and eyes are the secured core.

Step 1: EPA and DHA Instead of "Amount of Fish Oil"

The most common mistake: the big milligram figures on the front refer to the oil, not the fatty acids. Turn the pack over and look for the figures for EPA and DHA per serving. How much is sensible in total is clarified in Omega-3: how much per day? A good benchmark: the 250 mg that the approved statements refer to.

Step 2: Fish Oil, Algae Oil or Krill Oil?

The choice of source is the second major fork in the road. The direct comparisons: Fish oil vs. algae oil, Fish oil or krill oil? and for ALA sources Linseed oil vs. fish oil. Those living vegan will find the right answer in Covering omega-3 the vegan way with algae oil - algae oil delivers EPA and DHA directly, without the detour via the fish.

Step 3: Purity and Freshness - the Underrated Criterion

Because omega-3 comes from the marine food chain, low contaminant levels and freshness are central quality markers. Oil can oxidise over time (turn "rancid") - recognisable by an unpleasant taste and smell. Good products state a low oxidation value (TOTOX) and are gently processed. Details in Omega-3: recognising quality. If the fishy taste bothers you: Omega-3 without a fishy taste. The foundation remains lab testing and a look at additives & fillers.

Step 4: For Whom, When and For How Long

Whether supplementing makes sense is put into context by Omega-3: for whom is it worthwhile? - especially relevant for people who rarely eat fish. On timing, Omega-3: when to take it? helps (ideally with a fatty meal), and on duration Omega-3: how long to take it? Combination questions are answered by Omega-3 & vitamin D and Omega-3 & vitamin E. With blood thinners, before operations or during pregnancy, the rule is: check with a doctor.

Triglyceride or Ethyl Ester? A Look at the Oil Form

One detail increasingly declared on high-quality omega-3 oils is the chemical bonding form: triglyceride (TG or rTG) or ethyl ester (EE). In natural fish, omega-3 is present as a triglyceride. When concentrating up to high EPA/DHA contents, the ethyl ester form is often technically produced first; some manufacturers convert it back into the more natural (re-)triglyceride form. For you as a buyer this is no reason to panic, but a quality signal: a statement about the oil form shows that the manufacturer works transparently and has given thought to the processing. More important than the pure form, in the end, remains the combination of sufficient EPA/DHA, a low oxidation value and clean origin - but anyone comparing two otherwise equivalent products may draw on the oil form as an additional criterion. What lies behind such statements is put into context by Omega-3: recognising quality.

Origin and Sustainability

One criterion that many additionally weigh up is origin. With fish oil, the fish species and the fishing method play a role; algae oil is cultivated under controlled conditions and requires no fishing at all, which makes it attractive to many from a sustainability perspective too. Good products make information on origin and processing transparent. Those opting for plant-based alternatives will find guidance in Covering omega-3 the vegan way with algae oil; the basics of the organic claim are clarified in Organic in food supplements.

Common Mistakes When Buying Omega-3

1. Looking at the amount of oil instead of EPA/DHA - the big number on the front often says little.
2. Ignoring freshness - rancid oil is a real quality problem; look for low oxidation values.
3. Equating linseed oil with fish oil - linseed oil delivers only the precursor ALA, see Linseed oil vs. fish oil.
4. Buying very cheaply without lab testing - especially with marine oils, purity and low contaminant levels count.

How to Compare Two Omega-3 Products Fairly

An honest price comparison for omega-3 never runs via the pack price, but via the cost per 250 mg EPA+DHA - the amount to which the approved statements are tied. Here's how you do it: look on the back at how much EPA and DHA is in each capsule. Work out how many capsules you need for 250 mg. Set that in relation to the pack price and the number of capsules. A seemingly cheap product for which you need three capsules to get the 250 mg is in the end often more expensive than a highly concentrated one where a single capsule is enough - and you also swallow less oil and fewer calories. This calculation exposes most of the "1000 mg" promises on the front. How to buy price-consciously and yet sensibly is shown in Buying food supplements on a budget.

Which Omega-3 Suits You?

• You rarely or never eat fish: a rich source with a high EPA/DHA content - vegan as algae oil, see Covering omega-3 the vegan way.
• The fishy taste bothers you: look for fresh, well-processed oils and flavour-neutral capsules, see Omega-3 without a fishy taste.
• You want to know your status: the omega-3 index gives a reference point and helps with dosing.

Honestly Put Into Context

Omega-3 is one of the few supplement topics with clear, approved statements - which makes the choice comparatively factual. Those who benefit most are people who rarely eat fatty sea fish. Anyone who eats salmon, mackerel or herring twice a week already covers a good part through their diet. For everyone else, a targeted supplement with sufficient EPA and DHA, good purity and freshness is a sensible, solid choice - no hype, just basic supply. With blood thinners or during pregnancy, check with a doctor beforehand.

Matching Products from Scheunengut

Vegan omega-3 sources from microalgae can be found in the Algae category; thematically fitting are Heart & Circulation and Brain & Nerves. For the common combination, Vitamin D is worthwhile. All products are lab-tested and made in Germany.

Frequently Asked Questions (FAQ)

What should I look at first when buying omega-3?

At the EPA and DHA content per serving, not the big amount of oil on the front. Only once a product realistically reaches the 250 mg per day do the approved statements on heart, brain and vision apply. After that, the purity and freshness of the oil count.

Is algae oil just as good as fish oil?

Algae oil delivers EPA and DHA directly from microalgae - the original source from which the fish also absorbs these fatty acids. For people living vegan it is the obvious choice and additionally free of any fishy taste. In both cases, what remains decisive is the EPA/DHA content per serving.

Is linseed oil enough as an omega-3 source?

Linseed oil delivers the plant-based precursor ALA, which the body converts into EPA and DHA only to a small extent. For the approved statements, EPA and DHA count directly. Linseed oil is a sensible ALA supplement, but does not replace an EPA/DHA oil (fish or algae oil) one to one.

How do I recognise fresh, uncontaminated omega-3?

By a low oxidation value (TOTOX), a transparent statement of origin and a lab test for contaminants. Rancid oil gives itself away through an unpleasant taste and smell. Cool, dark storage keeps the oil fresh for longer.