A professor of public health in Scotland draws attention to the possible public health ramifications of low vitamin D:
We must waste no time putting the sunshine vitamin to the test

Here’s a quote from his article:

“the best way forward is a large-scale, Scotland-wide trial of the effectiveness and costs of vitamin D supplementation. Fortunately, we have been planning this very study for the past 15 months, with many vitamin D experts and enthusiasts (including Oliver Gillie and Dr Helga Rhein).”