Multiple choice

The vitamin that is most readily manufactured in our bodies is

  1. Vitamin A.

  2. Vitamin B.

  3. Vitamin C.

  4. Vitamin D.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vitamin D is the only vitamin that the human body can synthesize in adequate amounts when skin is exposed to sunlight. This process occurs in the skin through a reaction involving ultraviolet B radiation. While other vitamins must be obtained entirely from dietary sources, Vitamin D can be produced endogenously.

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