An iron-based composition is described. The composition can be used in conditions of total or relative iron deficiency. In particular, a solid composition is described, preferably in the form of powder or granules, for use in the treatment of disorders or diseases related to or derived from an iron deficiency. The composition is suitable for pediatric subjects, adolescents, athletes, men, women, pregnant women and elderly. Finally, a process for preparing the solid composition is also described.