The additional nutrients change the comparison
ODS describes cod liver oil as a source of vitamins A and D in addition to EPA and DHA. Ordinary fish-oil comparisons often focus on those fatty acids, so matching only total oil weight can miss other exposures. [1]
The amounts depend on the formulation. Read the declared EPA, DHA, vitamin A and vitamin D rather than assuming every product provides the same quantities. [1]
Include other sources of the same vitamins
Preformed vitamin A can be harmful in excess, including during pregnancy. Excess vitamin D can also cause toxicity. Their presence in an oil does not remove the need to count them alongside other supplements. [2][3]
A prenatal vitamin, multivitamin or separate vitamin product may contribute to the same totals. Product substitution should therefore preserve the complete nutrient picture, not only the intended omega-3 contribution. [2][3]
An omega-3 substitution may add another exposure
Imagine an adult replaces one fish-oil product with cod liver oil while continuing a multivitamin. Even if the EPA and DHA amounts were comparable, the new oil might add vitamins already present elsewhere.
The next useful step is to record those amounts and forms, rather than treating the oils as identical because both come from fish.
| Detail | Interpretation |
|---|---|
| EPA and DHA | Compare each declared amount |
| Vitamins A and D | Check additional exposure |
| Same capsule count | Does not establish equivalence |
A source name does not establish a safer or better product
This comparison does not rank brands, verify a batch or recommend cod liver oil for pregnancy. The relevant vitamin forms, quantities and clinical situation require their own assessment. [1][2][3]
For an omega-3 goal, identify EPA and DHA directly. For a vitamin deficiency or a prescribed regimen, do not substitute an oil based on this general ingredient comparison. [1][2][3]
Sources for this article
- NIH ODS: Omega-3 Fatty Acids
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product. - NIH ODS: Vitamin A and Carotenoids
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product. - NIH ODS: Vitamin D
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.