You'd have to be living in a locked box to have not heard all the recent headlines proclaiming the serious need for adequate levels of vitamin D.  Even Governor Palin was suspected of obtaining a used tanning machine in order to get a little sunlight exposure a couple to several times a week for bone density health.  Our bodies produce vitamin D when our skin is exposed to sunlight (without sun block).  Otherwise we typically get vitamin D from fortified foods and from supplements.  The...