On June 6, 1944, allied troops landed on the beaches of Normandy, France to fight Nazi Germany National Treasure: The Mold Behind the Miracle of Penicillin (04:55) The Mysterious Death of Edgar ...

Your skin naturally produces vitamin D3 when exposed to the sun. Eating fish, beef, and cheese provides a natural boost of vitamin D3, too. Still, vitamin D deficiency is a common problem that can ...