Most dietary sources of vitamin D do not contain sufficient amounts of the vitamin to satisfy daily requirements. According to the United States Department of Agriculture, certain fish (including salmon) and mushrooms contain higher amounts of vitamin D than most foods. Sensible sun exposure, especially between the hours of 10:00 am and 3:00 pm produces vitamin D in the skin that may last twice as long in the blood compared with ingested vitamin D.
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Cite this: Romesh Khardori. Fast Five Quiz: Vitamin D - Medscape - Jul 21, 2020.