Carboxytherapy consists in the intradermal injection of carbon dioxide (CO₂) into the tissues. The properties of this gas are multiple: it improves microcirculation, boosts local metabolism, and, in relation to fat, is lipolytic ("fat burning"). The body produces CO₂ naturally, at a rate of 200 ml per second. This amount may be ten times higher during exercise.
CO₂'s fat-burning properties are due to its distension of tissues, causing insufflation of the area and the release of different substances, which bind to receptors and activate lipolysis, or the breakdown of fats.