Capsule for the preparation of a nutritional product in a device adapted to supply liquid in the capsule, said capsule comprising: at least one compartment (13) containing nutritional ingredients for the preparation of the nutritional product in combination with the supplied liquid, a filter (18) adapted for removing contaminants contained in the liquid, wherein the filter (18, 20) has a filtering surface (F) smaller than the cross section (C) of the compartment and at least a part of its filtering surface (F) is preferably offset relative to the cross section (C) of the compartment when viewed in the axial projection of the capsule.