A cosmetic method for releasing an active principle in a controlled fashion to uninjured skin, as a function of the ion content in or on skin, by exchange with the ions, in order to provide at least one cosmetic benefit to the skin, the method includes applying onto skin a composition containing, in a cosmetically acceptable medium, at least one resinate including one organic ion-exchange resin and at least one ionizable cosmetic active principle bonded in noncovalent fashion to the resin.
