One size doesn't fit all for vitamin D and men: African-American men in northern regions especially need high doses of supplements

http://www.sciencedaily.com/releases/2011/09/110920100100.htm?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+sciencedaily+%28ScienceDaily%3A+Latest+Science+News%29&utm_content=FaceBook

ayman