This is a needleless tool adapted to dispense Hyaluronic Acid or the serum of your choosing into the epidermal and dermal layers of the skin. Since this is a needleless process, the skin is punctured using high pressure air to turn the hyaluronic acid into nanoscale molecules. The use of high pressure air allows for smooth and even distribution into the skin The HA pen can reach to the fifth layer of the skin's epidermis. The best feature about this tool is that it is pain free! Be sure to check your state guidelines, in most states you do not need to be a medical professional or have any special license to administer these products.