My doctor gave me a script for Suprep prep kit. I've done some checking and am a little alarmed to find it (and other prep kits) is phosphate based and that there are kidney damage issues associated with them. Colyte (I believe) is a Polyethylene glycol-electrolyte based kit and doesn't contain phosphates.
I'm thinking Colyte would be the safest over-all. Does anyone else have information on this? Are there any others that are not phosphate based?