The mesotherapy gun is a device used to perform very small and controlled injections into the skin, delivering tiny amounts of substances into the middle layer of the skin (mesoderm), such as hyaluronic acid, vitamins, amino acids and peptides, antioxidants, or treatments for hair loss. It contains a syringe filled with the solution or serum and allows adjustment of the injection depth, speed, and dosage, performing fast and precise micro-punctures that ensure a more even application with less discomfort compared to manual injections. The treatment is generally not painful, though slight redness may occur for a few hours, and typically 4–6 sessions are required every 2–3 weeks for optimal results.