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The page below is a sample from the LabCE course Vitamin D. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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As we age, our skin doesn't make as much vitamin D in response to sun exposure. At the same time, the kidneys become less efficient at converting vitamin D into the form calcitriol. Older adults also tend to spend more time indoors which in turn decreases the amount of sunlight they are exposed to; thus decreasing the amount of vitamin D produced.