No, Vit D is made deeply in the skin, from a cholesterol precursor.
If he has low cholesterol he may not make as much Vit D from exposure as others might.
There is talk of failure to produce ...but I haven't found much good info on that yet, just comments that some people lose the ability to make Vit D over time with age.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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