If we take a look at how a large proportion of teenagers are spending their time, the vast majority of it is not outside when their skin is directly exposed to sunlight. The recommendation for the general population is to take 10mcg of vitamin D in autumn and winter. People at risk are those who always cover their skin, are of ethnic minority groups with dark skin (African, Afro-Caribbean and South Asian background). The government currently recommends supplementing with 10mcg (400 IU) of vitamin D daily for people at risk of vitamin D deficiency.
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