An open-cooled component for a gas turbine is provided. The component includes an outer wall that is subjected to a hot gas and at least partially defines a first cavity for a first means. The outer wall is provided with through-openings which open up into the cavity on one side and into a hot gas chamber on the other. The inventive component also includes at least one second cavity for admixing a second means, said second cavity is connected to the through-openings in a fluid-connected manner. A combustion chamber for a gas turbine, and to a gas turbine including one such component is also provided.