Refers to a process for the preparation of hydroxide complexes of Iron (iii) and activated glucose syrup, which comprises the following steps: (i) providing an aqueous solution of haRabe of glucose with a dextrose equivalent (DE) of at least 21 and up to 60 as determined by GRAVIMETRIC analysis at a temperature in the range of 25 to 80 degrees centigrade and a pH in the range of 613 (ii) hydrogen peroxide and optionally add a catalytic amount of a catalyst of oxidation Solution (i)Allowing the solution to cool to a temperature between original materials to maintain the solution at this temperature for 5 minutes to 24 hours,Activated with glucose syrup (iii) convert glucose syrup in an activated complex with iron hydroxide (iii) and (iv) to obtain a complex of Iron (iii) HYDROXIDE and haRabe Where The Glucose activated complex obtained has an iron content in the range from 27% to 35% by weight based on the weight of the complex. It also relates to a Pharmaceutical composition.This complex can be used in the therapy of Iron deficiency in animals and general populationSe refiere a un procedimiento para la preparacion de complejos de hidroxido de hierro (III) y jarabe de glucosa activado que comprende las siguientes etapas: (i) proporcionar una solucion acuosa de jarabe de glucosa con un equivalente de dextrosa (DE) de al menos 21 y como maximo 60 como se determina por analisis gravimetrico a una temperatura en el rango de 25°C a 80°C y a un pH en el rango de 6 a 13 (ii) anadir peroxido de hidrogeno y opcionalmente una cantidad catalitica de un catalizador de oxidacion a la solucion (i), permitiendo que la solucion se enfrie a una temperatura entre 10°C a 45°C manteniendo la solucion a esta temperatura durante 5 minutos a 24 horas, obteniendose el jarabe de glucosa activado (iii) convertir dicho jarabe de glucosa activado en un complejo con hidroxido de hierro (III) y (iv) obtener un complejo de hidroxido de hierro (III) y jarabe de glucosa activado en donde el complejo
