Composition comprising metal ions or clusters such as ferrous and/or ferric iron compounds or magnesium, zinc, lanthanum and other metal ion compounds and fiber compounds such as gum Arabic 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.本案提供一種包含呈複合物之金屬離子或簇（諸如二價鐵及／或三價鐵鐵化合物或鎂、鋅、鑭及其他金屬離子化合物）以及纖維組分（諸如阿拉伯膠）的組成物，製備此等標的組成物之方法，及其用於吸附胃腸道及體外系統中之特定可及標的之處置的用途。
