Best Cod Liver Oil 2026: Vitamin A/D Disclosure, Then the A Limit
Informational summary — not medical advice. This page ranks product value and label transparency; on whether cod liver oil works, see the hub. Preformed vitamin A is a pregnancy teratogen at excess intake — pregnant people or those who might become pregnant should check the vitamin A number and consult a clinician before use. This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
Of the 5 cod liver oil products tracked here, only 2 disclose vitamin A to a number a reader can check against the 3000mcg RAE adult UL — both are Carlson's liquid oil (250mL and 500mL), at 255mcg RAE (8.5% of the UL) per teaspoon. 1 more product (Nordic Naturals) discloses omega-3 but not vitamin A or D. The remaining 2 (both NOW Foods products) disclose neither to a number, despite being the cheapest sticker prices — a real safety-transparency penalty for this category, not just a data gap, because you cannot manage a vitamin A ceiling you cannot see.
As an Amazon Associate we earn from qualifying purchases. Ranked by vitamin A disclosure first, proximity to the UL second, cost third — never commissions.
The one-line takeaway Carlson Norwegian Cod Liver Oil, Lemon, 500mL is the only tier here that discloses vitamin A AND vitamin D to a number, at 8.5% of the adult UL per teaspoon — the honest "best" pick for a category where the label transparency itself is the safety feature. Skip products that only say "excellent source of vitamins A and D" without a number — you cannot verify the vitamin A load from that label.
Every product compared: omega-3, vitamin A, vitamin D & cost
Sorted vitamin-A-disclosed products first (lowest % of the UL first), then the omega-3-only-disclosed product, then fully undisclosed last (cheapest cost/day). Read the Vitamin A column before the price — it is the category's real safety axis. Full data is a public CC BY JSON file.
| Product | Form | Omega-3 (EPA+DHA) | Vitamin A | % of UL | Vitamin D | $/day |
|---|---|---|---|---|---|---|
| Carlson Norwegian Cod Liver Oil, Lemon, 250mL | Liquid | 1100 mg | 255 mcg RAE | 8.5% | 400 IU | $0.64 |
| Carlson Norwegian Cod Liver Oil, Lemon, 500mL | Liquid | 1100 mg | 255 mcg RAE | 8.5% | 400 IU | $0.61 |
| Nordic Naturals Arctic Cod Liver Oil, Lemon, 180 Softgels | Softgel | 750 mg | Not disclosed | Unknowable | Not disclosed | $0.47 |
| NOW Foods Cod Liver Oil, 650mg, 250 Softgels | Softgel | Not disclosed | Not disclosed | Unknowable | Not disclosed | $0.05 |
| NOW Foods Cod Liver Oil Extra Strength, 1,000mg, 180 Softgels | Softgel | Not disclosed | Not disclosed | Unknowable | Not disclosed | $0.10 |
Prices are live Amazon buy-box figures, verified July 19, 2026; they move. Cost/day = price ÷ servings per container. % of UL = disclosed vitamin A mcg RAE ÷ 3000mcg RAE (adult upper limit), null where vitamin A is not disclosed to a number. "Not disclosed" means the brand states a qualitative claim ("excellent source") without a checkable figure.
Why the cheapest products here aren't the "best" pick
NOW Foods Cod Liver Oil, 650mg, 250 Softgels and its sibling NOW Foods product have the lowest cost per day in this comparison — but both are labeled only "excellent source of vitamins A and D-3," with no EPA+DHA mg and no vitamin A/D IU or mcg figure disclosed anywhere reachable this session. For most supplement categories that's a minor annoyance. For cod liver oil, it means you cannot tell whether one softgel delivers 2% or 20% of the vitamin A UL — and that is exactly the number this category asks you to track, especially if you also take a daily multivitamin. Nordic Naturals discloses 750mg of total omega-3 per 2-softgel serving (a real, checkable figure), but its vitamin A and D content were not confirmed from any source reached this session — a partial improvement over the NOW products, still a real gap for the category's core safety question.
Frequently asked questions
What is the best cod liver oil supplement?
Discloses vitamin A to a number first, then lowest % of the UL, then disclosed omega-3 and cost. Only 2 of 5 products here disclose vitamin A to a checkable figure — both are Carlson's liquid oil.
Why does an undisclosed vitamin A number matter more here?
Vitamin A is this category's real safety constraint. Without a number, you can't check a serving against the 3000mcg RAE UL or account for multivitamin stacking — treated as a real safety-transparency penalty, not a minor gap.
Is the cheapest cod liver oil the best value?
No. The cheapest products (NOW Foods) disclose neither EPA+DHA nor vitamin A/D to a number — you can't verify what you're actually taking.
Why isn't Rosita or Twinlab in this ranking?
Rosita has no Amazon listing found this session (DTC-only); Twinlab's ASIN could not be independently confirmed as live. Both are referenced editorially, not ranked or buyable here.
Related
- Cod liver oil: what it is & who it's for
- Cod liver oil dosage guide — the vitamin A stacking math
- Cod liver oil for joint pain
- Cod liver oil vs. fish oil vs. vitamin D
Sources
- Manufacturer labels and live Amazon pricing for all listed products, verified July 19, 2026. Full dataset: /cod-liver-oil/cost-by-brand.json (CC BY 4.0).
- NIH Office of Dietary Supplements — Vitamin A fact sheet (3000mcg RAE/day adult upper limit, preformed vitamin A).
- Rothman KJ, et al. "Teratogenicity of high vitamin A intake." N Engl J Med. 1995. PMID: 7477116