![Football](http://www.4bonehealth.org/wp-content/uploads/2011/07/football-300x100.png)
Vitamin D is linked with muscle function and performance. A new study shows low vitamin D even in professional football players. In a small study of a single NFL team, researchers included vitamin D levels as part of the routine pre-season evaluation conducted in the spring of 2010. Only one-fifth of the players had normal… Read more