After seeing some good reviews I succumbed and bought a Bear Mini. It comes with a sample of the serum but it's so expensive to keep buying!
Is there anything else I can use? I've heard about people using ultrasound gel or the conductive gel you can get for TENS machines but is it ok to put these on the face?
The other option I was thinking about was aloe vera gel or hyaluronic acid serum or even a facial oil, though this might be hard to clean off the device.
I guess it comes down to the purpose of the serum - is it to help the device glide over the skin or is it to help the current?