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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.
Complications With Certain Medications. According to the University of Maryland Medical Center, vitamin D taken at the same time as cholesterol lowering drugs can cause the drug to be less effective. (Ref 3) As well, bile acid sequestrants, also used to lower cholesterol, can cause low vitamin D levels. Similarly, certain weight loss drugs that reduce the amount of fat your body absorbs from food can cause low vitamin D levels. The medication may affect how readily your body absorbs vitamin D.