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Vitamin D in winter: 10 micrograms a day, cod liver oil or tablets – and why the Norwegian sun no longer helps
From October the sun is too low for your skin to make vitamin D. Norway’s health authorities recommend 10 micrograms a day – 20 for those over 75. Here are the doses, the food sources, the safe upper limit and the met.no figures showing how low the sun sits in Oslo, Trondheim and Tromsø.