Medical Discovery News, Jan. 17, 2009 This week's episode, broadcast by numerous radio stations, including KUHT-FM 88.7, Public Radio in Houston, is about the importance of Vitamin D. A recent report says that insufficient amounts of the vitamin are linked to some cancers. Another report by the American Academy of Pediatrics says that every child in America should be taking a daily vitamin D supplement. The recommendation used to be 200 international units per day. Now the recommendation is twice that at 400IUs per day.