Compositions comprising ferrous and/or ferric iron compounds and fiber in a complex, methods for preparing such compositions of matter, and the use thereof for treatment of adsorbing certain accessible targets in the gastrointestinal tract and in an extracorporeal system, are provided herein.本文提供組成物,其包含於複合物中之二價鐵及/或三價鐵化合物和纖維,製備此組成物之方法,及其於胃腸道及於體外系統中吸附某些可得之標的物以供治療之用途。