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Curated, not stocked.
Green Pasture is the brand most consistently associated with the Weston A. Price preparation of fermented cod liver oil, and this blend is their flagship product. We stock it because the fermentation method and the butter oil pairing represent a genuinely distinct approach to fat-soluble vitamin delivery — one that several of our clinicians use with patients who want whole-food sources of vitamins A, D and K2 alongside omega-3s, rather than synthetic isolates.
About this product
Fermented Cod Liver Oil and Concentrated Butter Oil (Liquid)
Green Pasture's fermented cod liver oil and concentrated butter oil blend is the preparation most closely associated with the nutritional research of Dr Weston A. Price. It combines two whole-food oils in a single daily liquid dose.
The cod liver oil is slow-fermented rather than heat-extracted, a process that preserves naturally occurring omega-3 fatty acids EPA and DHA alongside fat-soluble vitamins A and D in the forms found in the whole food. The butter oil is concentrated from grass-fed dairy through centrifugation, and contributes vitamin K2 — the fat-soluble vitamin studied for its role in directing calcium towards bones and teeth rather than soft tissue.
The ingredient list is short: fermented cod liver oil, concentrated butter oil, and silicon dioxide as an anti-caking agent. No fillers, no flavour masking agents listed beyond what the two base oils provide.
This blend suits adults who want fat-soluble vitamins A, D and K2 alongside omega-3s in a traditionally prepared, whole-food form — particularly those who prefer to avoid synthetic isolates. The liquid format means the dose is easy to adjust under clinical guidance.
Vitamin D supports normal bone and muscle function; DHA supports normal brain function and vision; vitamin A contributes to normal immune function; vitamin K2 contributes to normal blood clotting and bone maintenance. These are established nutrient functions, not claims specific to this product.
One ingredient worth noting: this product contains both fish and milk. Anyone with allergies to either should not use it.
What it does
Benefits
- 01
EPA and DHA omega-3s from fermented, not heat-extracted, cod liver oil
- 02
Fat-soluble vitamins A, D and K2 from whole-food sources
- 03
Vitamin K2 to support calcium direction to bones and teeth
- 04
Short ingredient list: two oils and an anti-caking agent
- 05
Liquid format allows dose adjustment under clinical guidance
Get the most from it
How to use
Take half a teaspoon (approximately 2 ml) once daily, or as directed by your clinician. It can be taken straight from the spoon or stirred into a small amount of honey, nut butter, or juice. Shake gently before use, refrigerate after opening, and consume within 60 days.
What's inside
Ingredients
View full ingredient list
Raw fermented cod (fish) liver oil, raw butter (milk) oil concentrated through centrifugation, anti-caking agent (silicon dioxide). Contains fish and milk. For allergens, see ingredients in bold.
Common questions
Frequently asked
Why fermented rather than heat-extracted cod liver oil?
Heat extraction can degrade heat-sensitive nutrients. Fermentation processes the liver without high temperatures, which is why proponents of this method argue it better preserves the naturally occurring vitamins and fatty acids present in the whole food. It is the traditional preparation and the one Dr Weston A. Price documented in ancestral diets.
What is butter oil and why is it included?
Butter oil is produced by centrifuging fat from grass-fed dairy milk, concentrating the fat-soluble nutrients found in the cream. It contributes vitamin K2 to the blend, which is studied for its role in calcium metabolism — specifically in directing calcium towards bone rather than arterial tissue. The two oils together provide vitamins A, D and K2 in combination.
This contains both fish and milk — what should I know?
Yes. The product contains fish (fermented cod liver oil) and milk (butter oil). It is not suitable for anyone with an allergy or intolerance to either. The allergens are highlighted in bold on the ingredient label.
Is this safe to take if I am pregnant, breastfeeding, or on medication?
Vitamins A and K2 both warrant caution in specific circumstances — high vitamin A intake is contraindicated in pregnancy, and vitamin K2 may interact with anticoagulant therapy. Consult your clinician before use if you are pregnant, breastfeeding, taking any medication, or have a blood-clotting condition.
How long will one bottle last, and how should I store it?
The 188 ml bottle provides approximately 90 servings at the recommended half-teaspoon daily dose. Refrigerate after opening and consume within 60 days. Store with the seal intact in a cool, dry place before opening.
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