Should you worry about iron overload? Horse owners who are interested in equine nutrition, and actively involved in planning the composition of their horse’s diet, will know that iron intake has become a subject of much discussion. Terms such as “iron overload” are easy to find using a Google search, and the risks associated with “free radicals” and “oxidative stress” are often coupled to the amount of iron in the equine diet. Iron levels in typical equine diets have been targeted as the reason for many equine health issues, including metabolic conditions, reduced immune function, poor hair coat and hoof wall, and developmental disease in growing horses. The internet has several popular websites available for the average horse owner to “educate” themselves about iron in the equine diet. Frequently, these sites also have products offered for sale or have links to sites that sell products that are supposed to help the horse with “iron overload.” So just what is iron overload in the equine diet, and do horse owners really need to worry about it?