How CarboxyTherapy works? This device uses the beneficial effects of carbon dioxide. When CO2 is injected under the skin it increases the circulation of oxygen which results in increased production of elastin and collagen. After all this processes, body fat, cellulite or other issue is greatly reduced and CO2 is naturally transferred to the lung when patient exhales it without any problem. There is no need for anesthesia, the pain is mostly insignificant but it may depend on treatment area.