Abstract: The present invention relates to a carbon dioxide dispenser and a cap (2) for introducing carbon dioxide to a bottle (1). The carbon dioxide dispenser of the invention comprises a pressurized carbon dioxide source, such as a pressure vessel (3), a pressure regulator (7), flow means (4, 6) for feeding carbon dioxide from the carbon dioxide source to a bottle, and said cap (2) provided with a valve for connecting said means to the bottle (1). The present invention provides a carbon dioxide dispenser which is easy to handle and has a reliable valve means which can be used by anyone without any risk of explosion during use. The invention also provides a carbon dioxide dispenser for effectively distributing the introduced carbon dioxide in the bottle. For this purpose the cap (2) comprises in its end facing the bottle (1) a distribution means (8) for atomizing the carbon dioxide so that, when flowing into the bottle, it is more effectively absorbed by the beverage in the bottle.