What additives should be used in a conductive gel for electrotherapy?

[urk]

I need to make a conductive gel substance for elektrotherapy.

What kind of substances do manufacturers often put in such a gel to make it highly electrically conductive?
I think i need electrolytes (salts, acids and bases)... Am i thinking right?

I'm not very good at this, so i hope anybody out there wants to help me:-)

 

[Borek]

If it is to be used in the therapy it probably should meet the standards/norms as they are defined in your country. Preparing gel without knowing these things is a dangerous idea and the one we can't help you in.