Conductive Gel or Ultrasound Gel Recommended options: Ultrasound Gel – water-based, non-sticky, allows proper energy conduction. Aloe Vera Gel – soothing, natural, and commonly used for home treatments. Slimming Gel (optional) – some contain active ingredients (like caffeine, L-carnitine) that claim to enhance fat burning. Massage oil – only if using the RF or EMS massage function, but avoid oil during cavitation mode, as oil can block ultrasonic waves. Best Practice: For cavitation + RF: Use ultrasound gel. For body massage only: You can use massage oil or cream.