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This letter from the Chief Medical Officers for the United Kingdom raises awareness of the risk of vitamin D deficiency amongst certain groups particularly:
All pregnant and breastfeeding women
Infants and young children under 5 years of age
Older people aged 65 years and over
People who have low or no exposure to the sun
People who have darker skin
The letter also contains a list of recommendations issued by all the UK health departments for people at-risk on whether they may need to take vitamin D supplements.