Carboxytherapy works in two complimentary ways. Firstly, and quite simply carbon dioxide mechanically kills fat cells. Secondly, it also has a strong vasodilatory effect (causes dilation of blood vessels) on the capillaries in the area. Wider vessels mean bigger and stronger blood flow to the area, which means more oxygen. The increase in oxygen is important because it eliminates the built up fluid from between the cells. The end result is fewer fat cells and firmer subcutaneous tissue.*