http://www.energyfirst.com/Vitamin-D : Drinking copious amounts of milk isn’t good for you, but it is laced with vitamin D, an important vitamin for our body.  Vitamin D, contrary to popular belief is not calcium; rather, vitamin D helps with calcium absorption.  It’s also good for the skin.  Speaking of the skin, you can get vitamin D by sitting out in the sun, but this is only healthy if you’re not out there for too long.