No special gel is required to use RevitalEyes. However, for best results, we recommend pairing it with our Peach Niacinamide Serum, which was formulated to work perfectly with the device. If you prefer to use a different product, choose a gel-based or water-based eye serum to help conduct the microcurrent comfortably. Avoid oil-based serums, as they can block conductivity and reduce effectiveness.