From that link: > The generally adequate vitamin D status in the Nordic countries is due to the use of cod liver oil and supplements (46) and vitamin D fortifi

From that link: > The generally adequate vitamin D status in the Nordic countries is due to the use of cod liver oil and supplements (46) and vitamin D fortification, leading to a great improvement in Finland during the last decade (47). Doesn't surprise me; here in the South we don't get deficient enough to cause obvious issues, so we don't pay attention to it.