http://articles.mercola.com/sites/articles/archive/2004/04/17/iron-endurance.aspxStudies have shown that the endurance levels of women low on iron may be shortened, even among women who have not developed full-blown anemia. On a more positive note, women who take a sufficient amount of iron may help correct the problem. The studyenCommunityServer 2008.5 SP1 (Build: 31106.3070)