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Best Cod Liver Oil Supplement (2026)
Cod liver oil delivers omega-3 EPA+DHA, vitamin A, and vitamin D from a single bottle - and that all-in-one packaging is both the feature and the trap. The clinical omega-3 dose is 1,000-2,000mg EPA+DHA daily, but most cod liver oil capsules contain only 200-300mg EPA+DHA per serving. Scaling the capsule count to reach a clinical omega-3 dose pushes preformed vitamin A intake toward (or past) the 3,000mcg RAE/day tolerable upper limit, where toxicity becomes real - liver damage, bone loss, birth defects in pregnancy. The honest verdict: for most people, fish oil plus a separate vitamin D3 is the cleaner stack. Cod liver oil makes sense only if you want a single product, are not taking other vitamin A sources, and use a properly dosed liquid format. We scored 10 cod liver oils on EPA+DHA per serving, IFOS purity testing, vitamin A content per serving, and cost per 1,000mg EPA+DHA.
See the full Cod Liver Oil scorecard →What the Evidence Says About Cod Liver Oil
How A-F grades work- ACardiovascular health and triglyceride reduction
- BAnti-inflammatory effects and rheumatoid arthritis
- AVitamin D provision (bone health, immune function)
- BVitamin A provision (vision, immune function)
- CCognitive health and brain development
- CDepression and mood improvement
A = strong RCT evidence · B = moderate · C = limited · D = weak · F = no evidence.
Our Top Picks
Carlson Cod Liver Oil (Lemon)
$0.22/day at effective dose
Detailed Reviews
Nordic Naturals Arctic Cod Liver Oil (Lemon)
triglyceride-form liquid, lemon flavored | 1060mg EPA+DHA/serving | 48 servings
The benchmark cod liver oil. Excellent purity testing, pleasant lemon flavor, and transparent labeling. The standard other CLO products are measured against.
Check Price on Amazon →Carlson Cod Liver Oil (Lemon)
triglyceride-form liquid, lemon flavored | 1100mg EPA+DHA/serving | 100 servings
Excellent omega-3 content per serving with meaningfully better pricing than Nordic Naturals at the 200-tsp bottle size. The vitamin A content (850mcg RAE) per tsp is moderate and manageable for most adults.
Check Price on Amazon →Nordic Naturals Arctic CLO Softgels
triglyceride-form softgel capsules | 750mg EPA+DHA/serving | 30 servings
Convenient capsule format from a trusted brand, but you sacrifice dose efficiency versus the liquid version. Pay more per mg of omega-3. Best for people who cannot tolerate liquid CLO.
Check Price on Amazon →Also Scored
Garden of Life Olde World Icelandic Cod Liver Oil (Lemon Mint)
$0.37/day | liquid, lemon mint flavored, from wild-caught Icelandic cod
NOW Foods Cod Liver Oil 1,000mg Softgels
$0.24/day | softgel capsules, molecularly distilled
Dropi Pure Icelandic Cod Liver Oil
$0.80/day | extra virgin liquid, cold-processed, unflavored
Rosita Extra Virgin Cod Liver Oil (EVCLO)
$1.63/day | extra virgin liquid, unrefined, unflavored
Solgar Norwegian Cod Liver Oil Softgels
$0.53/day | softgel capsules
Nature Made Cod Liver Oil 1,000mg Softgels
$0.41/day | softgel capsules
Green Pasture Blue Ice Fermented Cod Liver Oil
$1.50/day | fermented liquid or capsules
What to Look For When Buying
- ✓Compare EPA+DHA per serving, not total cod liver oil mg - a '1,000mg cod liver oil' capsule typically delivers only 200-300mg EPA+DHA
- ✓The vitamin A ceiling is 3,000mcg RAE/day - check label content and add it to your multivitamin, liver, and fortified-food intake before scaling the dose
- ✓Liquid lemon-flavored cod liver oil hits clinical omega-3 doses in 1 tsp; most capsule products force 4-6 caps with proportionally more vitamin A
- ✓IFOS Certified or IFOS 5-Star is the gold-standard third-party test for omega-3 purity, oxidation, and heavy-metal contaminants
- ✓Avoid fermented cod liver oil - independent 2015 testing of the major fermented brand found rancidity markers and inconsistent nutrient levels
- ✓Refrigerate liquid after opening and use within 90 days - omega-3s oxidize quickly and rancid oil delivers harmful lipid peroxides, not benefits
Frequently Asked Questions
What is the difference between cod liver oil and regular fish oil?
Both provide EPA and DHA omega-3 fatty acids, but cod liver oil is extracted specifically from cod livers, which are rich in stored vitamins A and D. Regular fish oil is typically extracted from the body tissues of fatty fish (anchovies, sardines, mackerel) and contains little to no vitamin A or D. Fish oil generally provides higher concentrations of EPA and DHA per serving. The trade-off: cod liver oil gives you a multi-nutrient package but limits how much omega-3 you can take before vitamin A becomes a concern.
Can I take cod liver oil and a multivitamin together?
You need to check the vitamin A content carefully. Most multivitamins contain 700-900mcg RAE of preformed vitamin A. A tablespoon of cod liver oil can add another 1,000-4,500mcg RAE depending on the brand. The tolerable upper limit for adults is 3,000mcg RAE/day. If the combined total from your multivitamin, cod liver oil, and diet exceeds that, you risk vitamin A toxicity over time. Either choose a multivitamin without preformed vitamin A (one that uses beta-carotene instead) or switch to regular fish oil.
Is fermented cod liver oil better than regular cod liver oil?
This is controversial. Fermented cod liver oil (most notably from Green Pasture) was marketed as a traditional, minimally processed alternative. However, in 2015, independent testing by Dr. Daniel found significant quality concerns with Green Pasture's product, including rancidity markers and inconsistent nutrient levels. The fermentation process has no proven benefit over standard molecular distillation for cod liver oil. Most experts and third-party testing organizations recommend conventionally processed cod liver oil from established brands with verifiable third-party testing.
Is cod liver oil safe during pregnancy?
This requires careful attention. Omega-3 DHA is beneficial during pregnancy for fetal brain development, and moderate vitamin D is helpful. However, preformed vitamin A above 3,000mcg RAE/day is teratogenic - it causes birth defects. Some cod liver oil products contain enough vitamin A per serving that a double dose or combination with a prenatal vitamin could approach this limit. Most OB-GYNs recommend a prenatal DHA supplement (from fish oil or algal oil) rather than cod liver oil specifically because it avoids the vitamin A risk entirely.
How should I store cod liver oil?
Liquid cod liver oil should be refrigerated after opening and used within 90 days. Omega-3 fatty acids oxidize when exposed to heat, light, and air, producing harmful lipid peroxides and a rancid taste. Store capsules in a cool, dry place away from direct sunlight. Never use cod liver oil that smells strongly fishy or off - that is a sign of oxidation. High-quality products use nitrogen flushing and antioxidants (vitamin E/tocopherols) to slow oxidation.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.