SupplementsFatty acidsOmega-3Vitamins
Cod liver oil is an old-fashioned tonic that’s still useful: it supplies EPA/DHA along with fat-soluble vitamins A and D — the reason it once prevented rickets.
Key takeaways
- Provides omega-3 (EPA/DHA) plus vitamin A and vitamin D.
- A handy source of vitamin D in low-sun winters.
- Watch total vitamin A — don’t stack with other high-A supplements, and use caution in pregnancy (excess vitamin A is harmful).
- Lower in EPA+DHA than concentrated fish oil.
What it is
Oil from cod livers, naturally rich in the fat-soluble vitamins A and D as well as omega-3s.
The evidence
Historically it eliminated rickets via vitamin D, and it remains a reasonable combined source of omega-3 and vitamin D. Its EPA+DHA content is modest, so it’s not the most efficient pure omega-3.
Dose & safety
Follow the label and tally your vitamin A from all sources to stay within safe limits. In pregnancy, avoid high-dose vitamin A — choose a low-A or plain omega-3 instead.
Who benefits
People wanting omega-3 + winter vitamin D in one, who aren’t already taking high-dose vitamin A.
References
Adult research summary for education, not a prescription.
- Cod liver oil: omega-3 with vitamins A and D — overview. www.barebiology.com
This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.