Carlson Labs Cod Liver Oil delivers 1,100 mg of omega-3s per teaspoon with naturally occurring vitamins A and D, sourced from Norwegian Arctic cod and tested by FDA-registered labs for purity. Nordic Naturals Arctic Cod Liver Oil offers a comparable omega-3 dose in both liquid and softgel formats, while Rosita Real Foods stands out for those seeking a completely raw, unprocessed option extracted without heat or chemicals.
Carlson Labs Cod Liver Oil — Best for Freshness and Third-Party Testing
Carlson Labs has been producing cod liver oil since 1965, and the liquid formula remains one of the most rigorously tested options on the market. Each teaspoon provides 1,100 mg of omega-3 fatty acids (EPA and DHA), plus naturally occurring vitamins A and D. The oil is sourced from wild-caught Norwegian Arctic cod using traditional, sustainable methods, then processed and bottled the same day the fish are caught.
What sets Carlson Labs apart is the testing protocol. Every batch is analyzed by an FDA-registered laboratory for freshness, potency, and purity, and the company participates in the International Fish Oil Standards (IFOS) program—a third-party certification that rates fish oils on parameters including heavy metal content and oxidation levels. The oil is bottled with vitamin E and given a nitrogen flush to prevent oxidation, which helps preserve the delicate omega-3 fatty acids.
The liquid comes in four flavors: lemon, green apple, fruit splash, and unflavored. Most users report a clean taste with minimal fishiness, though the unflavored version does have a mild cod liver taste. One downside: the bottle must be refrigerated after opening and used within 100 days, which may not suit everyone’s routine. Pricing is mid-range for a premium cod liver oil, typically around $25–$30 for a 500 mL bottle.
Nordic Naturals Arctic Cod Liver Oil — Best for Format Flexibility
Nordic Naturals Arctic Cod Liver Oil is available in both liquid and softgel forms, making it a versatile choice for households with different preferences. The liquid provides 1,060 mg of omega-3s per teaspoon, while the softgels deliver 750 mg per three-capsule serving. Both are sourced from 100% wild Arctic cod caught in Norwegian waters.
Nordic Naturals processes its cod liver oil in the triglyceride form—the molecular structure naturally found in fish—which the company claims supports better absorption compared to ethyl ester forms used by some competitors. The oil is third-party tested and Friend of the Sea certified, and the company operates a zero-waste facility powered by biofuel.
The liquid comes in lemon, orange, strawberry, and unflavored varieties, all with a light, fruity taste that masks any fishiness. The softgels are lemon-flavored and chewable, which is helpful for people who have trouble swallowing pills. The main trade-off is price: Nordic Naturals typically runs $5–$10 more per comparable volume than Carlson Labs, and the liquid must be refrigerated and used within three months of opening.
Rosita Real Foods Extra Virgin Cod Liver Oil — Best for Minimal Processing
Rosita markets itself as the only truly raw, unprocessed cod liver oil on the market. The company uses a proprietary cold-extraction method that releases the oil from cod livers without heat, chemicals, or mechanical processing. The fish are wild-caught by hand in Norwegian fjords, and the oil is bottled within 48 hours of harvest.
Because the oil is unrefined, it retains all naturally occurring vitamins A and D—no synthetic vitamins are added back in, which is common practice among most other brands. The nutrient profile varies slightly from batch to batch depending on the size of the fish and seasonal factors, which Rosita views as a feature rather than a flaw. Each batch is third-party tested to meet European and WHO standards for purity.
The liquid has a pale golden color and a mild, fishy taste—closer to fresh fish than the flavored oils from Carlson or Nordic Naturals. Rosita also offers softgels for those who prefer to avoid the taste. The biggest drawback is cost: a 150 mL bottle runs around $60–$70, making it one of the priciest options per serving. It’s a niche product aimed at people who prioritize traditional food preparation methods and are willing to pay a premium for minimal intervention.
Garden of Life Dr. Formulated Alaskan Cod Liver Oil — Best for U.S.-Sourced Fish
Garden of Life’s cod liver oil is sourced from line-caught Alaskan cod rather than Norwegian fish, which appeals to buyers looking for a domestic supply chain. The liquid provides 1,000 mg of omega-3s per teaspoon, along with vitamins A and D. It’s Non-GMO Project Verified and carries both MSC (Marine Stewardship Council) and Friend of the Sea certifications for sustainable sourcing.
The formula includes specialized pro-resolving mediators (SPMs), compounds that the brand claims support the body’s natural inflammatory response. The oil has a lemon-rosemary flavor that’s pleasant but slightly more herbal than the citrus-forward taste of Carlson or Nordic Naturals.
Garden of Life’s Alaskan cod liver oil is positioned as a premium product, with pricing similar to Nordic Naturals. It’s a solid choice for those who want traceable, U.S.-sourced fish and appreciate the added SPM compounds, though the clinical evidence for SPMs in cod liver oil is still emerging. Like most liquid fish oils, it requires refrigeration after opening and should be used within 90 days.
Now Foods Cod Liver Oil Extra Strength — Best Budget Option
Now Foods offers a straightforward, no-frills cod liver oil in softgel form. Each capsule provides 1,000 mg of cod liver oil with naturally occurring EPA, DHA, and vitamins A and D3. The fish are sourced from multiple fisheries, and the oil undergoes molecular distillation to remove contaminants.
Now Foods doesn’t carry the same third-party certifications as Carlson, Nordic Naturals, or Garden of Life, but the company does test for heavy metals and publishes certificates of analysis on request. The softgels are unflavored and have minimal aftertaste, though some users report mild fishy burps if taken on an empty stomach.
The main appeal is price: a 180-softgel bottle typically costs $15–$20, making it one of the most affordable cod liver oils per serving. It’s a practical choice for people who want the benefits of cod liver oil without premium sourcing or extensive third-party testing, though it lacks the transparency and freshness guarantees of higher-priced competitors.
Dropi Icelandic Cod Liver Oil — Best for Traceability
Dropi is a small Icelandic company that sources cod exclusively from the Westfjords of Iceland and uses a QR code system that allows buyers to trace each batch back to the specific fishing grounds and processing date. The oil is cold-pressed and provides vitamins A and D along with omega-3 fatty acids.
Dropi’s cod liver oil is lightly flavored with real cold-pressed lemon oil rather than artificial or natural flavors, which gives it a clean, citrus taste. The company emphasizes transparency and publishes full nutrient analysis for each batch online. The oil is produced according to European Good Manufacturing Practice standards.
Availability outside of Iceland can be inconsistent, and pricing is on the higher end—comparable to Rosita or Nordic Naturals. It’s a strong option for buyers who value supply chain transparency and are willing to navigate limited distribution channels.
ProductBest ForOmega-3s Per ServingKey FeaturePrice Range Carlson Labs Cod Liver OilFreshness and third-party testing1,100 mg (liquid, 1 tsp)IFOS certified, FDA-registered lab testing$25–$30 (500 mL)Nordic Naturals Arctic Cod Liver OilFormat flexibility1,060 mg (liquid, 1 tsp) / 750 mg (softgels, 3 caps)Triglyceride form, Friend of the Sea certified$30–$40 (16 oz liquid)Rosita Real Foods Extra VirginMinimal processingVaries by batchRaw, unprocessed, no synthetic vitamins$60–$70 (150 mL)Garden of Life Dr. Formulated AlaskanU.S.-sourced fish1,000 mg (1 tsp)Alaskan cod, SPMs, MSC certified$25–$35 (6.76 oz)Now Foods Extra StrengthBudget-conscious buyers1,000 mg (1 softgel)Affordable, molecularly distilled$15–$20 (180 softgels)Dropi IcelandicTraceabilityVaries by batchQR code traceability, real lemon oil$50–$60 (200 mL) Frequently Asked Questions What’s the difference between cod liver oil and regular fish oil?
Cod liver oil is extracted specifically from the livers of codfish, which makes it naturally rich in vitamins A and D in addition to omega-3 fatty acids. Regular fish oil comes from the body tissue of fatty fish like sardines, anchovies, or mackerel and typically contains only omega-3s (EPA and DHA) without significant amounts of fat-soluble vitamins. If you’re looking to supplement both omega-3s and vitamins A and D, cod liver oil offers a two-in-one option.
How much cod liver oil should I take daily?
Most brands recommend one teaspoon of liquid cod liver oil or two to three softgels per day, which typically provides 750–1,100 mg of omega-3s. The National Institutes of Health notes that there is no established recommended daily intake for omega-3s, but many health organizations suggest 250–500 mg of combined EPA and DHA for general health. Because cod liver oil also contains vitamins A and D, check the label to avoid exceeding the upper intake limits for these fat-soluble vitamins, especially if you’re taking other supplements.
Does third-party testing really matter for fish oil?
Yes. Third-party testing verifies that a fish oil meets standards for purity (absence of heavy metals, PCBs, and other contaminants), potency (actual omega-3 content matches the label), and freshness (low oxidation levels). Programs like IFOS and certifications from organizations like NSF International provide independent verification that goes beyond a manufacturer’s internal quality control. Fish oils that aren’t tested or don’t publish results may contain oxidized fats or contaminants that reduce effectiveness and safety.
Can I take cod liver oil if I’m on blood thinners?
Omega-3 fatty acids can affect blood clotting, so anyone taking anticoagulant medications like warfarin or aspirin should consult a healthcare provider before starting cod liver oil. The interaction isn’t necessarily dangerous, but your doctor may need to adjust your medication dosage or monitor your blood more frequently.
Why do some cod liver oils need refrigeration and others don’t?
Liquid cod liver oils are more exposed to oxygen and light, which accelerates oxidation and rancidity. Refrigeration slows this process. Softgels are encapsulated in a protective gelatin shell that shields the oil from oxygen, so they’re more stable at room temperature. That said, even softgels benefit from cool, dark storage to maximize shelf life. If a liquid cod liver oil doesn’t require refrigeration, it’s likely been heavily processed or contains preservatives to extend stability.
As with anything you read on the internet, this article should not be construed as medical advice; please talk to your doctor or primary care provider before changing your wellness routine. WHN neither agrees nor disagrees with any of the materials posted. This article is not intended to provide a medical diagnosis, recommendation, treatment, or endorsement.
Opinion Disclaimer: The views and opinions expressed in this article are those of the author and do not necessarily reflect the official policy of WHN. Any content provided by guest authors is of their own opinion and is not intended to malign any religion, ethnic group, club, organization, company, individual, or anyone or anything else. The Food and Drug Administration has not evaluated these statements.