Table of Content
Key Takeaways:
- Both fish oil and cod liver oil provide the omega-3 fatty acids EPA and DHA but their sources differ.
- Fish oil is primarily valued for its EPA and DHA content, while cod liver oil provides omega-3 fatty acids along with naturally-occurring vitamins A and D.
- Both fish oil and cod liver oil can be used to support heart, brain, eye, and joint health, with EPA & DHA playing a key role in both.
- The main distinction in their nutritional profile is the additional vitamins found in cod liver oil over fish oil.
- Their selection should depend on your nutritional requirements.
Introduction:
If you’re a millennial, you’ve most certainly heard of cod liver oil in your childhood. Popularised by Indian brands in the Nineties, it was given by parents to their children for bone health and nutrition. If you’re a Gen-Z, you may not be familiar with cod liver oil but have most likely taken a fish oil supplement at some point. Cod liver oil and fish oil are both popular supplements widely used for their rich omega-3 content. While cod liver oil has been used for centuries, particularly in European countries, fish oil has become immensely popular only in the post-COVID era. The main difference between cod liver oil and fish oil is that while cod liver oil is obtained from the liver of cod fish, fish oil is obtained from the fatty tissues of oily fish like sardine, salmon, mackerel, herring, and tuna. Unlike fish oil, which is a good source of only EPA and DHA, cod liver oil is rich in omega-3 along with vitamins A and D. In this blog, we’ll assess the benefits, differences, and uses of cod liver oil vs fish oil and help you assess which one is better for you based on your nutritional needs.
What Is Fish Oil?
Fish oil is an oil derived from the tissues of oily fish such as sardines, herring, mackerel, and tuna. It is particularly valued for its long-chain omega-3 fatty acids, EPA and DHA.
1. Source & Extraction
Fish oil is generally obtained from the tissues of oily fish. The oil then undergoes processing to remove impurities and purify the omega-3 content.
2. Key Nutrients
The key nutrients found in fish oil are EPA and DHA. The concentrations vary depending on the fish and processing used.
3. Health Purpose
Fish oil is primarily used to increase dietary intake of EPA and DHA, particularly when fish is not consumed through diet regularly.
Possible Benefits:
1. Improves Cardiovascular Health: Omega-3 fatty acids EPA and DHA may help reduce triglyceride levels and support cardiovascular health.
2. Supports Cognitive Health: DHA is an important structural component of the brain and improves brain function.
3. Promotes Healthy Vision: DHA is a key structural component of the retina that supports healthy vision.
4. Supports Joint Health: Omega-3 fatty acids help lower inflammation, easing joint pain and supporting joint health.
5. Supports Healthy Skin: Omega-3 fatty acids improve skin hydration by locking in moisture and maintaining the skin barrier. This can also help prevent dry itchy skin and scalp.
What is Cod Liver Oil?
Cod liver oil is a type of fish oil obtained specifically from the liver of cod fish. Cod liver oil provides the omega-3 fatty acids EPA and DHA, along with the fat-soluble vitamins A and D. This makes the composition of cod liver oil distinct from standard fish oil.
1. Source and Extraction
Cod liver oil is extracted specifically from cod liver, whereas conventional fish oil is generally obtained from fish tissue.
2. Key Nutrients
Cod liver oil contains EPA, DHA, vitamins A and D. However, the nutrients can substantially vary depending on the cod species, source, and extraction method.
3. Health Purpose
Cod liver oil is primarily used to increase dietary intake of omega-3 fatty acids and vitamins A and D.
Benefits of Cod Liver Oil
1. Supports Heart Health: Cod liver oil is high in EPA, which supports heart health by lowering blood triglycerides and relaxing blood vessels.
2. Improves Bone Health: Vitamin D in cod liver oil contributes to the process of calcium absorption and maintains healthy bones.
3. Boosts Eye health: Cod liver oil naturally contains vitamin A that is essential for vision, whereas DHA is an important element of the retina.
4. Supports Brain Health: DHA is an important component of the brain structure, and cod liver oil is high in DHA, which helps support cognitive and brain health.
5. Reduces Inflammation: Cod liver oil has powerful anti-inflammatory properties and can help lower inflammation all over the body.
6. Supports Immune Function: Cod liver oil supports immune function primarily due to presence of vitamins A and D, alongside omega-3 fatty acids that help maintain immune health.
7. Promotes Skin Health: Cod liver oil supports skin health primarily due to the presence of both vitamin A and omega-3 fatty acids.
Cod Liver Oil vs Fish Oil: Core Differences Compared
Although both oils provide the omega-3 fatty acids EPA and DHA, they differ in their sources and nutritional profiles. Knowing how the two are different from each other will help you make an informed choice based on your nutritional requirements. Here is a quick preview of the important differences between the two.
|
Feature |
Fish Oil |
Cod Liver Oil |
|
Nutrient profile |
Primarily focused on marine omega-3 fatty acids |
Combines marine omega-3 fatty acids with fat-soluble vitamins |
|
EPA + DHA role |
Often selected when consuming EPA and DHA is the main objective |
Doesn’t just provide EPA and DHA but also offers vitamins A and D |
|
Vitamin contribution |
Generally little or no vitamin A and D unless added additionally to the formulation |
Vitamins A and D are naturally present |
|
Formulation flexibility |
Available in concentrated EPA/DHA formulations |
Usually less focused on maximizing omega-3 concentration because of its additional vitamin content |
|
Best suited for |
People primarily looking for an EPA/DHA supplement |
People looking for omega-3s alongside vitamins A and D |
|
Vitamin A consideration |
Usually not a major consideration |
Intake should be considered because excessive vitamin A can be harmful |
|
Vitamin D consideration |
Usually not a major consideration unless fortified |
Can contribute to vitamin D intake |
Thus, it can be seen clearly that the difference between cod liver oil and fish oil does not solely lie in the source of origin. The key difference is that fish oil is primarily valued for its EPA and DHA content, while cod liver oil provides these omega-3s along with vitamins A and D.
Side Effects, Risks, and Dosage Guidelines
Both fish oil and cod liver oil are generally well tolerated when used in accordance with instructions. Nevertheless, since these dietary supplements have their own specific nutrient composition, one should take into account the dosage and possible health risks associated with their use.
Dosage
- Fish oil: The right dosage of fish oil capsule is determined by the content of EPA and DHA. It is advised to follow the recommended serving size or dosage as stated on the supplement label or ask your healthcare provider for advice.
- Cod liver oil: The recommended dosage of cod liver oil is determined by its EPA, DHA, vitamin A, and vitamin D content. Do not exceed the recommended dosage on the label.
Side Effects
Being sourced from fish both these dietary supplements may cause side effects like fishy aftertaste, belching or burping, heartburn, nausea, or diarrhoea.
Risks
- Fish oil: Use of large dosages of fish oil may influence the process of blood clotting and result in increased bleeding, especially when used with other medications. Persons using anticoagulant and anti-platelet medications or with bleeding disorders need to consult their doctors before consuming high-dose fish oil supplements. Pregnant women should avoid taking these supplements unless suggested by doctor.
- Cod liver oil: Since cod liver oil has a higher content of vitamin A and vitamin D, overconsumption may cause vitamin A and vitamin D toxicity. Consistent or high consumption would mean that you are receiving excess amounts of both vitamins, especially when taking other supplements containing these vitamins. Pregnant women should avoid taking these supplements unless suggested by a doctor.
Conclusion
Both cod liver oil and fish oil have been shown effective in lowering triglycerides and inflammation due to the presence of omega-3 fatty acids. If you’re seeking only omega-3s, fish oil is the better choice as they’re a richer source. However, if you’re seeking vitamin A and vitamin D supplementation for bone health, then you can opt for cod liver oil. However, cod liver oil consumption comes with its own risks of vitamin A toxicity and drug interactions with blood thinners, blood pressure medications, and diabetes medications, so it would be prudent to consult a doctor before using these. Fish oil is the better choice when it comes to safe supplementation.
FAQs
1. Can I take cod liver oil and fish oil together?
There is not much nutritional benefit of taking both cod liver oil and fish oil together as both provide omega-3 fatty acids. While cod liver oil does provide vitamins A and D, a dual dosage of omega-3 from two supplements offers little benefit, and on the other hand, increases the risk of exceeding the recommended dosage.
2. Is cod liver oil better than fish oil for joint pain?
No. Both cod liver oil and fish oil provide omega-3 fatty acids, which have anti-inflammatory properties. Some clinical studies have shown that fish oil supplementation may help manage symptoms of certain inflammatory joint conditions.
3. Which has more omega-3 — cod liver oil or fish oil?
Fish oil supplements generally contain a higher concentration of EPA and DHA than cod liver oil, although the nutrient contents can vary among different brand products.
4. Does fish oil contain vitamin A?
No, standard fish oil is generally not a significant source of vitamin A naturally, whereas cod liver oil naturally contains vitamin A.
5. What is the best time of day to take fish oil or cod liver oil?
The best time to consume them is with a main meal, preferably one containing some fat, to improve absorption and reduce stomach discomfort.