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Vitamin D status decreases with age, mainly as a result of restricted sunlight exposure, reduced capacity of the skin to produce vitamin D, and reduced dietary vitamin D intake. We measured wintertime serum 25-hydroxyvitamin D [25(OH)D] concentrations in 824 elderly people from 11 European countries. 36% of men and 47% of women had 25(OH)D concentrations below 30 nmol/L. Users of vitamin D supplements...
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