Risk factors: You can not know for sure without blood work as the many symptoms of low d are non-specific, but it is pretty much certain that all americans become deficient in the winter unless they supplement with d or live in the deep south & get mid-day sun without sunscreen. Since you live in fl, if you get unprotected mid-day sun year-round you might be ok without supplementing.
Answered 5/30/2013
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