Disclosed is an iron supply agent which, manufactured using only raw materials derived from natural products, is capable of stably supplying over a long period water-soluble iron ions even under alkaline conditions in which iron ions are prone to become insoluble. Also disclosed is an iron supply agent which, manufactured using only raw materials safe for human ingestion, is capable of supplying water-soluble iron ions. Further disclosed is an iron supply agent which, manufactured using trivalent iron as the iron feedstock, is capable of supplying water-soluble iron ions (in particular, divalent iron ions). Also disclosed is a water-soluble iron supply agent formed to contain as an active component the reaction product obtained by mixing in the presence of water an iron feedstock containing trivalent iron and a metal ion soluble component feedstock comprising crushed and roasted coffee beans and/or tea leaves. Said water-soluble iron supply agent reduces trivalent iron to divalent iron ions and maintains the same in that state, and is capable of supplying water-soluble iron ions (divalent iron ions) stably over a long period.La présente invention concerne un agent apporteur de fer, qui est fabriqué uniquement à base de matières premières tirées de produits naturels, et qui est capable dapporter sur une longue durée des ions de fer hydrosoluble, mais dans des conditions alcalines dans lesquelles les ions de fer ont tendance à devenir insoluble. Linvention concerne également un agent apporteur de fer, qui est fabriqué uniquement à base de matières premières sans danger en cas dingestion humaine, et qui est capable dapporter des ions de fer hydrosolubles. Linvention concerne aussi un agent apporteur de fer, qui est fabriqué à partir dune charge de départ constituée de fer trivalent, et qui est capable dapporter des ions de fer hydrosolubles, en particulier des ions de fer divalent. Linvention concerne enfin un agent apporteur de fer hydrosoluble constitué de façon à co
