Two oils from the sea, two different roles in winter.
When the days get shorter, the question returns to the counter: cod liver oil or omega-3? Both provide EPA and DHA, but only cod liver oil naturally contains vitamin D and vitamin A. This guide explains the difference, who each option makes sense for and what to check on the label before choosing.
Cod liver oil: what sets it apart from a standard omega-3
The difference starts with the origin. Cod liver oil is extracted from the fish's liver, the organ where cod stores fat-soluble vitamins. Therefore, in addition to the fatty acids EPA and DHA, it naturally contains vitamin A and vitamin D. A classic omega-3 supplement, or fish oil, is obtained from the bodies of small fish such as anchovies or sardines and focuses on EPA and DHA, usually in more concentrated doses and with little or no vitamin.
In practice, cod liver oil works as a "two-in-one" for the colder months, while omega-3 allows you to adjust the dose of EPA and DHA more precisely. Neither is better overall: the choice depends on your diet, sun exposure and the other supplements you already take.
There are two useful points for winter. Vitamin D is the nutrient with the most reasons to be in the "winter kit" between October and April. And catching sun through a window doesn't help, because the glass blocks the UVB radiation needed for its synthesis.
| Criterion | Cod liver oil | Omega-3 (fish oil) |
|---|---|---|
| Origin | Cod liver | Bodies of small fish (anchovy, sardine, mackerel) or krill |
| EPA and DHA | Present, in moderate amounts | Generally more concentrated per dose |
| Vitamin D | Naturally present | Absent, unless added |
| Vitamin A | Naturally present: requires attention to the total dose | Absent, unless added |
| Best fit | Those who want EPA, DHA and vitamin D in one go in winter | Those looking for higher doses of EPA/DHA or who already take vitamin A/D |
Four pillars for choosing with criteria
Start with your diet
Those who eat oily fish (sardines, mackerel, salmon) twice a week already get EPA and DHA from their diet. In that case, the vitamin D in cod liver oil may be the deciding factor in winter.
Read the EPA and DHA per dose
The label should indicate how many milligrams of EPA and DHA each dose contains, not just the total amount of oil. It is this number that allows you to compare products and see if it reaches the daily 250 mg.
Add up the vitamin A from all sources
Vitamin A accumulates in the body. Before adding cod liver oil to a multivitamin or another product with retinol, it is advisable to add up the doses and stay well below the maximum limit.
Prefer freshness and purity
Oils from the sea oxidise. Brands with traceable origins, purification processes and a fresh taste (without a rancid smell) are a good sign. After opening, store as indicated on the label, often in the refrigerator.
The limit that matters for cod liver oil
The EFSA maintains 3000 µg per day as the maximum safe level of preformed vitamin A for adults, including pregnant women and postmenopausal women, and advises those who are pregnant or planning to become pregnant not to consume liver products. During pregnancy, the most prudent choice is an omega-3 without vitamin A, with professional guidance.
Which makes the most sense in your case?
Some common situations, and the option that usually fits best. These are starting points: the final decision should take into account your complete routine.
Little sun and little fish
Cod liver oil combines EPA, DHA and vitamin D in a single dose.
Want more EPA and DHA
A concentrated omega-3 allows you to reach higher doses without accumulating vitamins.
Already taking vitamin D
Omega-3 without vitamins avoids doubling doses. Always add up the daily total.
Planning or pregnant
Prefer omega-3 without vitamin A, with professional advice.
Children
There are oils and gummies specifically for children. Respect the age and dose on the label.
Don't like the taste
Capsules avoid the taste. Oils with lemon are a liquid alternative.
Taking anticoagulants
Talk to your doctor before starting high doses of omega-3.
Fish allergy
Avoid fish oils and look for alternatives with professional guidance.
Omega-3 and vitamin D in winter: a complement, not a shortcut
No oil replaces a varied diet with oily fish, sufficient sleep, movement and sun exposure whenever the weather allows. Within this framework, supplementation can complete what is missing. EPA and DHA fatty acids contribute to the normal functioning of the heart (from 250 mg per day), and DHA contributes to the maintenance of normal brain and vision functioning (from 250 mg of DHA per day). Vitamin D contributes to the normal functioning of the immune system and to the maintenance of normal bones and muscles. Vitamin A contributes to the maintenance of normal vision and to the normal functioning of the immune system.
Rosita Cod Liver Oil 150 ml
Why it can help: extra virgin cod liver oil from wild Norwegian cod, extracted without heat, which provides EPA, DHA and vitamins A and D in the form they exist in the fish itself. It is the natural option for those looking for a "two-in-one" in the sunnier months.
How to use: follow the dose indicated on the label and add up the vitamin A and D from other supplements. Do not combine with other liver products. During pregnancy, talk to a healthcare professional first.
View Rosita Cod Liver Oil →NORSAN Omega-3 Arktis, capsules
Why it can help: cod liver oil in capsules, for those who want the benefits of the oil without the taste.
How to use: with meals, in the dose indicated by the manufacturer, with the same attention to total vitamin A.
View NORSAN Arktis →Nordic Naturals Ultimate Omega
Why it can help: omega-3 fish oil with concentrated EPA and DHA and without vitamin A, suitable for those who already take vitamin D separately.
How to use: with a meal that contains fat, in the dose on the label.
View Nordic Naturals Ultimate Omega →NORSAN Omega-3 Total Lemon 200 ml
Why it can help: liquid fish oil with lemon flavour, practical for those who prefer to skip capsules.
How to use: one daily measure, pure or mixed in a yogurt or cold smoothie. Store in the refrigerator after opening.
View NORSAN Omega-3 Total →Those who choose an omega-3 without vitamins can complete with isolated vitamin D3: see the vitamin D3 selection. Food supplements do not replace a varied and balanced diet or a healthy lifestyle.
Questions about omega-3 and cod liver oil
What is omega-3 for?
EPA and DHA contribute to the normal functioning of the heart (from 250 mg per day), and DHA to the maintenance of normal brain and vision functioning. The most natural way to get them is oily fish. The supplement is useful when diet is not enough.
Can I take cod liver oil and vitamin D at the same time?
Yes, provided you add up the vitamin D from both sources and do not exceed the maximum limit of 100 µg (4000 IU) per day set by the EFSA for adults. Many people do not need both: check the doses on the label.
When to take vitamin D and omega-3?
Preferably with a meal that contains fat, such as lunch or dinner, because they are fat-soluble nutrients. More than the time, daily regularity matters.
Is krill oil better than fish oil?
It is another source of EPA and DHA, linked above all to phospholipids, with doses usually lower per capsule. There is no universal answer: compare the milligrams of EPA and DHA per dose and the price per daily dose.
References
- EFSA NDA Panel (2024). Scientific opinion on the tolerable upper intake level for preformed vitamin A and β-carotene. EFSA Journal. View study
- EFSA NDA Panel (2023). Scientific opinion on the tolerable upper intake level for vitamin D. EFSA Journal 21(8):8145. View study
"First the plate and as much sun as possible. Then, the oil that completes what is missing."
Cod liver oil and omega-3 do not compete: they meet different needs. The first combines EPA, DHA and vitamins A and D, and therefore requires attention to total doses. The second allows you to work with EPA and DHA more precisely. Reading the label, adding up the sources and adjusting to the season is what makes the difference between supplementing with criteria and accumulating products.
Explore omega-3 and cod liver oils
- Reference brands such as Rosita, NORSAN and Nordic Naturals
- Capsules and liquid oils for every preference
- Clear information about EPA, DHA and vitamins
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