Contact gel for ultrasound treatments ensures good conductivity of ultrasonic waves and facilitates the introduction of active substances into the skin. Additionally, it has moisturizing properties. This gel is necessary for the proper performance of treatments with the use of cosmetic devices: sonophoresis (ultrasound), iontophoresis, needle-free mesotherapy, RF radio waves, ultrasonic liposuction (cavitation), 2 in 1 ultrasonic photon massager. The cosmetic contains hyaluronic acid.