Tracing the Origins of Fermented Cod Liver Oil

Modern diets differ greatly from those of our ancestors. Historically, food was largely unprocessed, seasonal, and shaped by the natural availability of ingredients. Today, convenience foods such as frozen meals and fast food are widely accessible, offering ease but often lacking the depth of nutrition found in traditional diets.

In response, many people are returning to whole foods and whole-food supplements as part of a more intentional approach to eating. This shift emphasizes foods valued historically for their natural nutritional composition and prepared using time-honored methods.

Fermented cod liver oil (FCLO) is one such traditional food gaining renewed interest. With deep ancestral roots, it appeals to those seeking a closer connection to traditional nourishment and long-standing food practices.

A Traditional Approach to Eating

Traditional diets developed long before industrial food processing and fortification. Guided by nature’s cycles, ancestral cultures relied on whole ingredients and seasonal availability.

From Paleolithic hunter-gatherers to early agricultural societies, people prioritized foods recognized for their nutritional value and developed preservation methods to sustain them through times of scarcity. These dietary patterns were closely tied to the rhythms of nature.

Ancestral nutrition values included:

Eating From Nose to Tail

Wasting any part of a hunted or raised animal was uncommon in ancestral cultures. Across the globe, societies consumed organ meats, bones, marrow, and connective tissues. Indigenous North American tribes valued bone marrow, while many European, Asian, and African cuisines incorporated offal into everyday meals.

Examples of enduring traditional dishes include chitterlings and trotters in Southern U.S. cuisine, black pudding in the U.K., and yakitori in Japan.

Preserving Foods Through Methods Like Fermentation

Fermentation is among the oldest known food preservation methods, predating refrigeration by thousands of years. Beyond extending shelf life, fermentation was valued for its ability to transform flavor while maintaining the food’s natural character and nutrients.

Consuming Animal Fats and Organ Meats Rich in Naturally Occurring Vitamins

Ancestral diets often prized fats and organ meats over lean muscle meat. Dr. Weston A. Price’s research documented the use of butter, tallow, lard, and raw or lightly prepared organ meats among Swiss, Inuit, and African populations.

Fermented cod liver oil reflects these ancestral values. It originates from a time when food was preserved for seasonal use and respected for its contribution to a balanced diet. The nutrients it contains exist within a complete food matrix rather than being isolated or synthetically added.

The Impact of Fermentation on Cod Liver Oil

Fermentation is one of the oldest food preservation methods. It enhances shelf life while helping maintain the natural character of the food. In the case of fermented cod liver oil, the process allows the livers to break down naturally over time. 

During fermentation, enzymes from the fish itself and bacteria naturally present in the fish and salt break down the livers over time. This process produces a raw, unrefined oil that retains its naturally occurring fat-soluble nutrients. 

Green Pasture®, a company known for its commitment to whole food-based traditional nutrition, uses a natural fermentation process similar to ancestral methods. This approach preserves the oil in its natural, food-based form.

The result is an oil that retains its naturally occurring fat-soluble nutrients. It has a deep, earthy character, rich in aroma and flavor. Green Pasture® fermented cod liver oil is independently tested for purity and quality. It varies in nutrient content from batch to batch, reflecting the natural variation found in whole foods.

A Closer Look at the Nutrient Profile of Fermented Cod Liver Oil

Fermented cod liver oil is valued for its naturally occurring nutrients, preserved through traditional fermentation techniques.

Naturally Occurring Vitamins A and D

FCLO contains fat-soluble vitamins A and D in the forms naturally present in cod liver. These nutrients are inherent to the raw material and are not added during production

Omega Fatty Acids: EPA and DHA

Fermented cod liver oil contains a range of omega fatty acids, including omega-3s (EPA and DHA), as well as omega-6, omega-7, and omega-9. These fatty acids exist within the oil’s natural composition, alongside other compounds found in cod liver.

Natural Variability: A Hallmark of Whole Foods

As a traditionally fermented product, FCLO exhibits variations in nutrient levels. Factors such as season, diet, and environmental conditions influence the nutrient composition of the cod livers. This variability is characteristic of traditional foods and reflects the nature of FCLO as a whole-food supplement.

Absence of Synthetic Additives

FCLO is produced without the addition of synthetic vitamins, flavors, or preservatives. The fermentation process acts as a natural preservation method, maintaining the oil's nutrient content without artificial enhancements. This approach aligns with traditional food preparation practices and how they respect the natural composition of the food.

Disclaimer: This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Where Food Comes From Affects Its Nutrient Profile

Where food comes from significantly affects its nutrient profile. Soil health, environmental conditions, farming practices, and species variation all influence the nutritional characteristics of food.

The same principles apply to fish. Whether fish are wild-caught or farm-raised, the quality of their environment and diet directly impacts their nutritional composition. Factors such as water mineral content and ecosystem health play a role in nutrient density.

Green Pasture®’s Commitment to Traditional Sourcing and Production

Green Pasture®’s approach to producing fermented cod liver oil begins in the open waters of the North Pacific. The company sources cod livers from the Bering Sea. These waters support wild Alaskan cod and provide the natural setting long valued in ancestral food systems.

Cod From Clean, Cold Waters

The Bering Sea supports diverse marine life and remains distant from industrial runoff. Its cold, nutrient-rich waters provide an ideal habitat for wild Alaskan cod, aligning with ancestral sourcing practices that respected natural ecosystems.

Sourcing With Intention

Green Pasture® partners with Alaskan Leader Seafoods, which uses a hook-and-line fishing method. This selective approach is:

• Precise, targeting individual fish
• Low-impact, with minimal disruption to marine ecosystems
• Consistent with ancestral values, where harvesting respected natural balance

This method supports sustainability while prioritizing fish quality.

Prioritizing Sustainability: MSC Certification

Green Pasture®'s dedication to sustainable sourcing is recognized through certification of our fermented cod liver oil product line by the Marine Stewardship Council (MSC). This certification ensures that the cod livers used are sourced from fisheries that meet rigorous environmental sustainability and our products are Chain of Custody certified, ensuring there is accountability throughout the supply chain to help safeguard seafood supplies.

The MSC Chain of Custody Standard provides assurance that our products are supported by businesses along the supply chain that are committed to transparency and protecting the ocean.

Upholding Tradition

Every sourcing and production decision at Green Pasture® reflects a commitment to preserving the traditional character of fermented cod liver oil. These practices allow the company to:

• Honor traditional food preparation and ingredient use.
• Maintain natural variation without standardization.
• Protect the environments that sustain the food itself.

Explore Fermented Cod Liver Oil Products From Green Pasture®

Reconnecting with traditional nutrition encourages a relationship with food. It invites deeper consideration of how food supports life, not only through its ingredients but also through the methods and principles behind its preparation.

Green Pasture® fermented cod liver oil liquid and capsules are made with this mindset. From sourcing to fermentation, each step reflects respect for tradition, quality, and integrity.

Ready to explore Green Pasture® fermented cod liver oil for your kitchen? Learn more about our process and shop online for fermented cod liver oil products today.