Vitamin D is unique in that not only is very little obtained through a normal diet, but the principal source of serum.Vitamin D is endogenous production in the skin upon exposure to the UVB (290- 315nm) portion of the solar spectrum (1). Thus, factors that limit sun exposure and/or endogenous vitamin D synthesis greatly reduce serum 25-hydroxyvitamin D (25[OH]D) concentrations. Some of these limiting factors include geographic latitude, season of the year, melanin content of the skin, use of sunscreen or sun obscuring clothing, and lack of outdoor activity. Obesity, diet, and age can further limit serum vitamin D levels (2-7). Any of these factors, among others, can lead to chronic vitamin D deficiency.
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Vitamin D supplementation is a requirement during the winter to obtain optimal Vitamin D status
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