What is produce when the skin is exposed to sunlight?

Answer:
In white people, and other people with the right gene, Vitamin D.

Everybody produces melanin when exposed to the sun. Melanin is the chemical that darkens your skin as a defense against the sun.
First answer by Joe-Sixpack. Last edit by Joe-Sixpack. Contributor trust: 6 [recommend contributor recommended]. Question popularity: 1 [recommend question].