Great info & resources for those seeking the safest sunblock! The second link is an awesome site where you can type in your skin products and find out any dangerous chemicals used.
1: http://www.foodmatters.tv/articles-1/vitamin-d-myths-and-facts
2: http://breakingnews.ewg.org/2012sunscreen/best-sunscreens/best-beach-sport-sunscreens/