Fish oil and vitamin D

Not automatically. Cod liver oil naturally contains vitamin D, because it comes from the fish's liver, where vitamin D concentrates — but fish body oil, the kind made from sardines, anchovies and similar small fish, generally does not contain a meaningful amount unless a brand specifically adds it. Our Omega-3 softgel is a fish body oil concentrate, and its label does not list vitamin D.

Cod liver oil vs. fish body oil: the actual difference

This is the detail that gets lost in "fish oil" as a category name. According to the NIH Office of Dietary Supplements, cod liver oil is one of the few naturally vitamin D-rich foods, because the liver is where fish store fat-soluble vitamins. Fish body oil — pressed from the flesh and skin of fish rather than the liver — is a source of EPA and DHA, but not a comparable source of vitamin D. A bottle labeled "fish oil" without specifying "cod liver oil" is almost always the body-oil type, and its vitamin D content, if any, will be listed explicitly on the supplement facts panel rather than assumed from the name.

How to check any fish oil label for vitamin D

• Look at the ingredient name. "Cod liver oil" specifically is the traditional vitamin D source; "fish oil," "fish oil concentrate," or a named fish body oil (sardine, anchovy, menhaden) usually is not, on its own.
• Check the supplement facts panel for a separate vitamin D line. Some combination products add vitamin D deliberately and list it as its own row with its own IU amount — that's an added ingredient, not something inherent to the fish oil.
• Don't assume from the bottle's front label. "Omega-3 + D3" or similar wording on the front of a bottle means vitamin D was added; a plain "Omega-3 Fish Oil" bottle, like ours, generally has not.

Taking fish oil and vitamin D together

There's no documented interaction between fish oil and vitamin D at typical supplement doses. They're absorbed through different pathways — vitamin D is a fat-soluble vitamin, and EPA/DHA are fatty acids — and pairing them is a common formulation choice rather than something either nutrient depends on the other for. If you take a separate vitamin D supplement alongside a fish oil that doesn't contain any, that's simply two separate nutrients from two separate sources, not a combination that's been shown to need special timing.

Questions people ask

Is there vitamin D in fish oil?

In cod liver oil, yes, naturally. In a plain fish body oil concentrate — the more common kind sold as "fish oil," including ours — generally not, unless a brand adds it and states it on the panel.

Can I take omega-3 and vitamin D together?

Yes. No interaction has been documented between the two at typical supplement doses, whether they come from the same product or two separate ones.

Does fish oil supplement have vitamin D?

Only if the label says so specifically. Check the supplement facts panel for a vitamin D line with an IU amount — don't assume it's there because the product is called "fish oil."

Is omega-3 the same as vitamin D?

No. Omega-3s (EPA and DHA) are fatty acids; vitamin D is a fat-soluble vitamin. They're structurally and functionally different nutrients that happen to be sold together in some combination products.

Our product

Electric Tiger Omega-3 is fish oil concentrate: 1,000 mg per softgel, providing 180 mg of EPA and 120 mg of DHA, plus vitamin E as an antioxidant. No added vitamin D. Full panel here.

Sources

• National Institutes of Health, Office of Dietary Supplements. Vitamin D — Health Professional Fact Sheet.
• Flock MR, et al. Determinants of erythrocyte omega-3 fatty acid content in response to fish oil supplementation. PMID 24252845.
• Electric Tiger Omega-3 Supplement Facts: product page.

Related reading: what is fish oil, how to choose a good fish oil, and how much fish oil should you take a day.