The present invention relates to a food product which has been fortified in iron content, comprising a Fe3O4 sphere. The present invention also relates to an iron-containing additive for use in the above food product, in the form of a Fe3O4 sphere. The present invention further relates to a method for preparing the above food product, comprising the steps of adding or mixing the iron-containing additive in solid or dispersed form with the food product, wherein the iron-containing additive is in the form of a Fe3O4 sphere.