> ...a healthy individual can obtain 10,000 IU or more of Vitamin D produced by their own skin from being exposed to the sun for 20 to 30 minutes.
It seems like that 10,000IU/.5hr dose would be surface-area dependent. Are the face, hands, and maybe forearms sufficient? Or does that number depend on, erm... _all_ of the skin being exposed?
I read somewhere that 15 minutes direct sun exposure per day in a t-shirt between 11 AM and 3 PM is sufficient. Obviously that has to depend on the latitude of your location so I'm not sure how accurate or meaningful it is. And it does depend on the color of your skin. The darker your skin the more sun you need to get the same amount of vitamin D.
It seems like that 10,000IU/.5hr dose would be surface-area dependent. Are the face, hands, and maybe forearms sufficient? Or does that number depend on, erm... _all_ of the skin being exposed?