The invention relates to a dispensing head for a system for dispensing a product, said head comprising a body which has a well for mounting said head on a tube for the pressurised supply of the product and a recess which is in communication with said well, said recess being provided with an abutment, around which a nozzle is mounted so as to form, at the interface thereof, a path for dispensing the product between said recess and a passage for discharging said product, said head comprising a sheath which is attached around the periphery of the abutment in order to define at least one part of the dispensing path, said sheath being capable of ensuring microbiocidal action on the product contained in said dispensing path.