Article on Vitamin D and using full spectrum lighting to combat seasonal depression and sunlight to combat problems associated with inadequate Vitamin D absorption.
Vitamin D-rich foods: Per CNP, exposing prepped / chopped raw mushrooms to 15 minutes of sunlight before cooking in order to greatly increases the cooked mushrooms’ Vitamin D content. (Exposure to sunlight after cooking has no impact on the Vitamin D content.)
List of foods high in Vitamin D – most of which you’d be better off not eating.