Good, straightforward advice from the NHS here. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/ https://www.nhs.uk/conditions/vitamins-and-minera

Good, straightforward advice from the NHS here. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/ https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-... - just about the only vitamin that they recommend supplementing orally for the general population, at least during the winter months.