A description is given of an agent, in particular for adsorbing protein from protein-containing liquids in the food sector, comprising at least one smectitic layered silicate having a total cation exchange capacity of about 30 to 120 mVal/100 g, characterized in that the content of potassium ions is less than 50%, preferably less than 40%, but more than 8%, preferably more than 12%, of the total cation exchange capacity of the layered silicate. In addition, a description is given of a method for producing an adsorption agent, and also its preferred use.