Carboxytherapy is a minimally invasive cosmetic treatment that involves injecting small amounts of medical-grade carbon dioxide (CO₂) gas beneath the skin to improve blood circulation, increase oxygen delivery, and stimulate collagen production. It is commonly used to reduce the appearance of dark under-eye circles, cellulite, stretch marks, scars, fine lines, and loose skin. The procedure is typically quick, requires little to no downtime, and most people need multiple treatment sessions to achieve noticeable results. Although many patients report improvements, the scientific evidence supporting its effectiveness varies depending on the condition being treated, and the results are generally modest and temporary.