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Groups at greater risk

Older people (age 50 and over) have a higher risk of developing vitamin D deficiency because:

             a- The ability of skin to convert 7-dehydrocholesterol to pre-vitamin D3 is decreased in older individuals.

b- The kidneys, which help convert calcidiol to its active form, sometimes do not work well.

Newborn infants who are exclusively breastfed require vitamin D supplements. Breast milk does not contain significant levels of the vitamin.  Infant formula is generally fortified with vitamin D. so this requirement only applies to breastfed infants.

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