Icelandic Cod Liver Oil (Lýsi): Benefits, History & How to Take It

What is Lýsi?

Lýsi is oil extracted from the liver of Atlantic cod caught in Iceland's cold waters. The name comes from Old Norse meaning "light," as it was originally used to fuel lamps during dark winters before becoming a dietary supplement.

The transition to health supplement occurred gradually over centuries. Icelanders observed that families consuming cod liver oil stayed healthier through winter. By the 19th century, it was widely recognized as essential; by the 20th century, daily consumption was standard practice. Today, Lýsi hf, founded in 1938, produces Iceland's leading brand.

Why Icelandic Cod Liver Oil is Considered the Best

The Waters: Iceland's pristine Arctic waters between the Greenland Current and North Atlantic Drift contain minimal industrial pollution, resulting in cleaner oil from less-contaminated fish.

The Fish: Wild-caught Atlantic cod from cold waters produce livers with higher omega-3 concentrations than warm-water or farm-raised alternatives. Cold temperatures force cod to develop oil-rich livers as energy reserves.

Sustainable Fishing: Iceland's rigorous quota system, managed by the Marine and Freshwater Research Institute, ensures healthy cod populations through science-based catch limits.

Processing Standards: Icelandic producers use gentle extraction methods preserving nutritional profiles while removing environmental contaminants, meeting strict European and Icelandic quality standards.

Health Benefits of Cod Liver Oil

Omega-3 Fatty Acids (EPA & DHA)

Cod liver oil ranks among the richest natural sources of EPA and DHA omega-3s, which support heart health, brain function, and joint health. DHA comprises a major structural component of the brain, and the well-documented anti-inflammatory properties of omega-3s explain its popularity among older adults for generations.

Vitamin D

Iceland receives only 4–5 hours of winter daylight, preventing adequate vitamin D production. Cod liver oil provided Icelanders with reliable dietary vitamin D sources long before supplements existed. Vitamin D deficiency is widespread across northern latitudes, and daily lýsi consumption directly addresses this.

Vitamin A

Cod liver oil contains naturally occurring retinol, supporting vision, immune function, and skin health. Because it contains preformed vitamin A rather than plant-based beta-carotene, it's more readily absorbed by the body.

How to Take Cod Liver Oil

Liquid (The Traditional Way)

Icelanders traditionally take one tablespoon (about 15ml) daily from a spoon. Modern refined lýsi has significantly milder taste than expected. Flavored versions (especially lemon) are genuinely palatable. Consume first thing in morning before breakfast and store refrigerated after opening.

Capsules (The Modern Way)

Soft gel capsules deliver identical nutrients without taste concerns. Take with food for best absorption. Capsules offer convenient travel options.

For Children

Icelandic children typically receive half-dose of flavored lýsi from early childhood. Lemon-flavored versions are popular; some brands offer chewable gummies specifically for children.