Written by the Plenthera team (trained in orthomolecular nutrition). Scientifically reviewed in May 2026. Last updated: 28 May 2026.

Green Pasture Fermented Cod Liver Oil / Butter Oil is part of the American Green Pasture range — traditionally prepared wholefood supplements without synthetic additives or high-temperature processing. The Green Pasture cod liver oil and butter oil blend (Royal formula) combines fermented cod liver oil with concentrated butter oil. A synergy of vitamin A, D, K2-MK4 and omega 3. Here you will find all Plenthera products from Green Pasture Fermented Cod Liver Oil / Butter Oil.

On this pageAbout Green Pasture · What is Fermented Cod Liver Oil / Butter Oil used for? · How do you use it? · Frequently asked questions · Combine with · Sources

About Green Pasture

Green Pasture is an American wholefood brand specialising in fermented cod liver oil, concentrated butter oil and related traditional food supplements. Produced using a fermentation method (no heating), which preserves the natural balance of vitamin A and D. For those who prefer ancestral wholefood supplementation over standardised vitamin supplements.

What is Fermented Cod Liver Oil / Butter Oil used for?

The Green Pasture cod liver oil and butter oil blend (Royal formula) combines fermented cod liver oil with concentrated butter oil. A synergy of vitamin A, D, K2-MK4 and omega 3.

How do you use it?

Dosage

2 ml or 2 capsules per day, see label.

When to take

As drops or capsules; with a meal for optimal absorption.

Frequently asked questions

What is Green Pasture Fermented Cod Liver Oil / Butter Oil?

The Green Pasture cod liver oil and butter oil blend (Royal formula) combines fermented cod liver oil with concentrated butter oil. A synergy of vitamin A, D, K2-MK4 and omega 3. Part of the traditional Green Pasture range.

Why traditionally fermented or concentrated without heating?

Fermentation and low-temperature concentration preserve the natural vitamins and bioactive substances. With high heating (as in modern fish oil production), vitamin A and D are partly lost.

Why are the exact vitamin A and D levels not on the label?

Wholefood products have batch-variable levels. Green Pasture states that the vitamins are naturally present but vary — this avoids unproven claims and complies with EU Regulation (EU) 1169/2011.

Can I take Fermented Cod Liver Oil / Butter Oil during pregnancy?

Cod liver oil and liver products can provide vitamin A in high doses. During pregnancy: only on the advice of a midwife or doctor.

Does Fermented Cod Liver Oil / Butter Oil contain allergens?

See the product label for exact allergens — typically fish (cod or skate) and milk (in butter oil blends).

How do I store this?

In a cool, dry place; for liquid gels: refrigeration recommended after opening. Solidifying at low temperatures is normal.

Combine with other categories

Green Pasture Fermented Cod Liver Oil / Butter Oil fits into an ancestral wholefood approach:

• Green Pasture — all Green Pasture products
• Ancestral Food — ancestral wholefood context
• Omega 3 — for other omega 3 supplements
• Vitamin D — for separate vitamin D supplements
• Vitamin A — for separate vitamin A
• Vitamin K — for separate K2 MK7

Sources & references

• Green Pasture — product dossiers and origin
• EFSA — Tolerable Upper Intake Level for vitamin A (3,000 µg/day)
• Voedingscentrum (Netherlands Nutrition Centre) — history and use of cod liver oil

Disclaimer: This text is for informational purposes only and does not replace medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. If in doubt, always consult your doctor or an orthomolecular therapist.