http://articles.mercola.com/sites/articles/archive/2002/11/20/vitamin-d-part-twelve.aspxCounting on the sun alone for vitamin D will leave most people deprived of adequate amounts of this nutrient, especially during the winter in the northern parts of the US. This is true even for people who work outside during the summer and get plentyenCommunityServer 2008.5 SP1 (Build: 31106.3070)