How did people in the Arctic get vitamin D with little or no sunlight?

In the Arctic there is no sun in winter and weak sun the rest of the year. So how did the people living there in the distant past get enough vitamin D - the "sunshine" vitamin?

23 September 2020

How did people in the Arctic in the distant past deal with no sun in winter and weak sun the rest of the year? Did food provide vitamin D?

Roger Williams, Lucerne, Switzerland

According to the US National Institutes of Health, 100 grams of salmon or trout provides enough daily vitamin D for adults of most ages. This wouldn’t have been hard for a hunter-gatherer to find in Arctic Scandinavia, North America or Russia.

Guy Cox, School of medical sciences, University of Sydney, Australia

The major dietary source of vitamin D is oily fish, which was, and is, a staple…