Iron is needed for the production of red blood and lack of iron can lead to anemia. In addition, iron is needed for bones, skin, nails and teeth. I have trouble taking iron and even iron rich foods such as raw spinach, bother me. One iron supplement I can take is a liquid, small molecule iron by Mother Earth Minerals. It is absorbed directly into the bloodstream. Food sources for iron are apricots, peaches, blackstrap molasses, liver, spinach and brewers yeast to name a few.