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Your exposure to sunlight is limited. Because the body makes vitamin D when your skin is exposed to sunlight, you may be at risk of deficiency if you are homebound, live in northern latitudes, wear long robes or head coverings for religious reasons, or have an occupation that prevents sun exposure. You have dark skin.
Vitamin D is a hormone that helps your body absorb calcium and is essential for the health of bones and muscles. Most of the vitamin D you need is produced in the skin when it is exposed to sunlight. Small amounts are obtained from the diet. You may have low vitamin D if:You don't expose your skin to enough sunlight, or your body is unable to produce, absorb or obtain the vitamin D you need. You may be at increased risk of low vitamin D if you: + are confined indoors because of age, illness or disability.+ have dark skin.ou don't expose your skin to enough sunlight, or your body is unable to produce, absorb or obtain the vitamin D you need. You may be at increased risk of low vitamin D if you: + are confined indoors because of age, illness or disability. + have dark skin.