Electrode gel, otherwise known as electro sex gel, was designed especially for applying electrodes to the body—externally. It helps the electrode pad better adhere to the skin to provide a better sensation. Electrode conductive gel isn’t designed to be lube, so it shouldn’t be used internally.
That being said, with all of the insertable electro pleasure toys out there, companies have begun to make their own body-safe, conductive lubricants. There are water-based lube that includes small pieces of gold to make this lube extremely conductive—and entirely safe for use internally. These lubes are used with the electro stim toys to increase the sensation with your internal e-stim sex toys.