Multiple choice

Which of the following vitamins can be formed in the skin under action of sunshine?

  1. Vitamin D

  2. Vitamin B12

  3. Vitamin A

  4. Vitamin C

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vitamin D is uniquely synthesized in human skin when 7-dehydrocholesterol reacts with UVB radiation from sunlight, forming previtamin D3 which then converts to active vitamin D. No other vitamin is produced in this manner - vitamins A, B12, and C must be obtained from dietary sources.