TopicsSupplements and minerals
Cod liver oil
For dietary sources of vitamin d3
Most of the experts we follow recommend it.
Cod liver oil is worth exploring, but moderation is key due to vitamin content.
Who is behind it
Voices including a molecular biology PhD, a nutritional sciences PhD and a former research biochemist.
How strong the research is
Mostly expert experience so far, with published research still catching up.
In their words
“If you are using cod liver oil to get the vitamins that you can't get from food... cod liver oil on a daily basis can be a very good way of getting that.”
a nutritional sciences PhD
These foods offer about 70% of daily vitamin D requirements.
Cod liver oil delivers preformed vitamins A and D; broth provides glycine, collagen and minerals when patients can barely eat
Virgin cod liver oil is recommended as a top food for skin health.
Certain compounds may benefit gut health in SIBO.
With care
Some of the minds attach conditions. These are worth reading before you begin.
Cod liver oil provides vitamins A and D which fish oil generally does not; choice depends on dietary context
Carlson's cod liver oil provides a good ratio of vitamins A and D but lacks vitamin K2.
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Mostly expert experience so far, with published research still catching up.
None of the statements here come with a declared commercial interest. Last refreshed 4 September 2026.
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