Fish Oil vs Cod Liver Oil
Fish Oil and Cod Liver Oil compared on absorption, gut tolerance, and real cost per dose — the cheapest of each pulled live from the Amazon US catalog.
Updated September 2026
Side by side
| Attribute | Fish oil | Cod liver oil |
|---|---|---|
| Source | Body of oily fish | Cod liver |
| EPA + DHA per serving | Usually higher | Usually lower |
| Vitamins A and D | No | Yes |
| In pregnancy | Commonly used | Watch the vitamin A |
| Active deals tracked | 44 | 11 |
| Cheapest cost per dose | $0.06 (per 1200 mg) | $0.05 (per 650 mg) |
Both supply EPA and DHA as natural triglycerides (unless the fish oil is a concentrated ethyl-ester form). The difference is what comes with them: cod liver oil, pressed from the liver, carries vitamins A and D; fish oil, from the body of oily fish, does not.
Which to avoid / caveats
- Compare cost per elemental / active content, not the compound milligrams printed on the label — a bigger number on the front can hide less of what you actually absorb.
- The cheapest sticker price isn’t always the best value: our “cheapest per dose” figures normalise price across bottle sizes, so a larger count only wins if it truly costs less per serving.
Fish OilWell absorbed
Best for: Omega-3 intake without extra vitamins.
Best Fish Oil by cost per doseCod Liver Oil
Best for: Omega-3 plus vitamin D when you need both.
Best Cod Liver Oil by cost per doseCheapest Fish Oil
NEW
🐟 Fish Oil
Nature's Bounty Fish Oil Omega 3 Supplements - Supports Heart…
Cost per serving
$0.06
Cheap·−90%200 servings · ~200-day supply
Well absorbed
$11.40last seen · confirm on Amazon.com
Nature's Bounty · Amazon.com 0
See the offer Cheapest Cod Liver Oil
NEW
🐟 Cod Liver Oil
NOW Foods Supplements, Cod Liver Oil 650 mg, Excellent Source…
Cost per serving
$0.05
Cheap·−85%250 servings · ~250-day supply
$12.36Price from Amazon.com
NOW · Amazon.com 0
See the offer Frequently asked
Is cod liver oil better than fish oil?+
Only if you also want vitamins A and D. For omega-3s alone, fish oil gives more EPA + DHA per serving and avoids stacking vitamin A. Not medical advice.
Can you take fish oil and cod liver oil together?+
You can, but you double up on omega-3s and add vitamin A. Keep total preformed vitamin A from all supplements under the 3,000 mcg (10,000 IU) daily upper limit. Not medical advice.
Is Fish Oil or Cod Liver Oil cheaper per dose?+
The cheapest Fish Oil we track is $0.06 per serving; the cheapest Cod Liver Oil is $0.05 per serving — so Cod Liver Oil costs less per dose right now (September 2026).
How much Omega-3 do you need per day?+
There is no RDA; the IOM set Adequate Intakes (AIs) for ALA based on omega-3 intakes in healthy populations. For adults 19-50, that is 1.6 g/day for men and 1.1 g/day for women. Pregnancy is 1.4 g/day and lactation 1.3 g/day. The IOM did not establish specific intake recommendations for EPA or DHA. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Can you take too much Omega-3?+
The IOM set no upper limit (UL). High doses (900 mg/day EPA plus 600 mg/day DHA or more for several weeks) might reduce immune function; 2-15 g/day EPA and/or DHA might increase bleeding time. Both the FDA and EFSA consider up to about 5 g/day EPA and DHA safe; in two trials, 4 g/day for several years slightly raised atrial fibrillation risk in people with or at high risk of CVD. Mild side effects include bad breath, heartburn, nausea, and diarrhea. — per the NIH Office of Dietary Supplements; general information, not medical advice.
Dosage & safety answers sourced from the NIH Office of Dietary Supplements. General information, not medical advice.
What the research says
The fact sheet notes that when the IOM last reviewed omega-3s it established Adequate Intakes rather than a Tolerable Upper Intake Level (UL), so no UL is stated. The FDA specifies that the labels of dietary supplements should not recommend a daily intake of EPA and DHA higher than 2 g — per the NIH Office of Dietary Supplements.
A deficiency of essential fatty acids — either omega-3s or omega-6s — can cause rough, scaly skin and dermatitis, and plasma and tissue concentrations of DHA decrease when an omega-3 deficiency is present. However, classical essential fatty acid deficiency in healthy individuals in the United States is virtually nonexistent; clinical signs are usually only found in patients receiving parenteral nutrition that lacks polyunsaturated fatty acids — per the NIH Office of Dietary Supplements.
Related
Best Fish Oil by cost per doseBest Cod Liver Oil by cost per doseFish Oil dosage & factsCod Liver Oil dosage & factsSupplement price-spread study
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References & sources
- Health Professional fact sheet — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.