Wow, it seems to be good for everything. The only thing I have ever read it was good for kidney stones and in some articles they will mention gallstones.
Several years ago I used it for more than 6 months but when I did an ultrasound my 1" gallstone had not changed.
May be it will help for cholesterol stones, but since I don't know what my stone consists of, it might be harder since it is more than 10 years old.

On iherb.com I read under the messages that some people felt better when they took it but again noone mentioned if they ever had done an ultrasound so it is hard to tell why they had gallbladder pain.

I would still use the Epsom Salt with the flushes and use the chanca piedra as a regular supplement.

Did you ever have an ultrasound done so you know how many stones you have and what size they are.