Please copy/paste the following text to properly cite this HowStuffWorks article:
"Sun's Effect on Skin." 30 April 2005. HowStuffWorks.com. <http://health.howstuffworks.com/skin-care/beauty/sun-care/adam-200100.htm> 02 December 2009.
Limited exposure to the sun is a healthy way to help your skin produce vitamin D. Prolonged exposure to the sun can be harmful or even dangerous. Watch this animation to learn the sun's effect on the skin.
If the animation above isn't working, click here to get the Shockwave player.