This is a good article on the matter with more in depth information: http://www.solar-facts-and-advice.com/vitamin-D-from-the-sun.html http://www.solar-facts-an

This is a good article on the matter with more in depth information: http://www.solar-facts-and-advice.com/vitamin-D-from-the-sun.html http://www.solar-facts-and-advice.com/vitamin-D-from-the-sun... As one of the sibling commenter said, it very much depends on your skin shade and the location on Earth.