When might skin not know how to produce adequate vitamin D?

Answers:
I WOULD GO WITH THE LAST ANSWER-WHEN IT IS NOT EXPOSED TO SUNLIGHT
Without ample exposure to sunlight.
Right, you need sunlight for your skin to make the precursor of functional vitamin D (cholecalciferol). This precursor is then modified surrounded by the kidney and liver to give 1,25-dihydroxycholecalciferol, the active form.

If you don't have adequate exposure to sunlight, not enough of the precursor is formed in the skin, and you can't get the functional form. Source(s): Pharmacy student

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