You are a family practitioner. A woman with dark brown skin who lives in Michigan of the following patients you see is most likely to need Vitamin D supplements.
What is Vitamin D?
Vitamin D is a fat-soluble vitamin that is added to some foods, found naturally in a few, and sold as a dietary supplement. When ultraviolet (UV) rays from sunshine strike the skin and start the synthesis of vitamin D, it is also created endogenously.The body needs to go through two hydroxylations in order to activate vitamin D that is consumed through diet, supplements, and sun exposure. During the first hydroxylation, which takes place in the liver, vitamin D is changed into 25-hydroxyvitamin D, sometimes referred to as "calcidiol." The second hydroxylation, commonly known as "calcitriol," is predominantly carried out in the kidney and results in the physiologically active 1,25-dihydroxyvitamin D.
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