Fatty Acid

Cod Liver Oil

Also known as: CLO

Evidence

Traditional omega-3 source also providing vitamins A and D. Good winter supplement but watch vitamin A intake.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

Add Natural Factors Super Cod Liver Oil to your stack — free

The highest-scored Cod Liver Oil product in our catalog (83/100). Track dose and overlaps in the app.

Add it →

Every Cod Liver Oil product we have scored

#	Product	Score	Per serving
1	Natural Factors Super Cod Liver Oil	83 A-	$0.15
2	Nutricost Cod Liver Oil	82 A-	$0.15
3	Garden of Life Dr. Formulated Alaskan Cod Liver Oil - Lemon	81 A-	$0.51
4	NOW Foods Cod Liver Oil Extra Strength	74 B+	$0.10
5	Carlson Kid's Cod Liver Oil	74 B+	$0.46
6	Carlson Cod Liver Oil Gems, Super 1,000 mg	71 B	$0.29
7	Carlson Cod Liver Oil Minis	66 B-	$0.57
8	Carlson Solar D Gems 6,000 IU (150 mcg)	64 B-	$0.17
9	Carlson Cod Liver Oil Grab + Go Packs, Pouch	64 B-	$1.79
10	Carlson Cod Liver Oil	64 B-	$0.91
11	Carlson Cod Liver Oil, Low Vitamin A	64 B-	$0.35
12	Carlson Solar D Gems 2,000 IU (50 mcg)	64 B-	$0.18

Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.

Common questions

How much Cod Liver Oil should I take?

The typical range is 1-2 tsp or 2-4 capsules daily. Monitor vitamin A intake

When should I take Cod Liver Oil?

With food. Yes.

Which form of Cod Liver Oil is best?

Liquid — Traditional. Other forms in the catalog: Softgel.

Is Cod Liver Oil safe?

Commonly reported: Fishy taste, Burps. Serious warnings: Vitamin A toxicity if combined with other A sources. Vitamin A accumulates

Which Cod Liver Oil supplement scores highest?

Natural Factors Super Cod Liver Oil, at 83/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.

Primary uses

Omega-3s
Vitamin D
Vitamin A
Traditional health

How it works

EPA and DHA from fish liver
Natural vitamin A and D
Traditional remedy

Dosage

Typical range: 1-2 tsp or 2-4 capsules daily
Timing: With food
With food: Yes
Duration: Monitor vitamin A intake
Special populations: Winter months, northern latitudes

Forms

Liquid
Softgel

Safety

Common side effects

Fishy taste
Burps

Contraindications

Pregnancy (high doses vitamin A)

Products containing Cod Liver Oil

Top-scoring supplements in our catalog that list Cod Liver Oil on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Natural Factors

Nutricost

Garden of Life

Dr. Formulated Alaskan Cod Liver Oil - Lemon

Find on Amazon

NOW Foods

Cod Liver Oil Extra Strength

Find on Amazon

See all products →

Known interactions

Evidence notes

Traditional source of A, D, and omega-3s

Grade A: Multiple well-designed human trials support the main claims.

Related in Fatty Acid

Check a full stack

Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.

Open the checker

Where does Cod Liver Oil fit in your stack?

Answer two questions and get a stack graded on research — every ingredient scored on the evidence behind it, not the marketing.

Build my stack

2 questions · free · no account needed to start

Also on iPhone — get the free app

📬 Get new guides in your inbox

Evidence-based supplement guides, no spam

We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.

Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.