Green Pasture Fermented Cod Liver Oil · Liquid
Midday sun exposure when seasonally available; winter circadian support; cold exposure in northern Europe; fermented cod liver oil when a concentrated food-form source makes sense. The point is not “take D3.” The point is restoring the environment that teaches the body what to do with light.
A US source in the Tested Swaps directory. Check that it ships to Europe; where it does not, the directory lists a European alternative alongside it.