I'm not an expert but both products seem to do the job. It just depends on what you like to take. GCG breaks up the stones very well and it must help with the bile flow because it also has bupleurum in it. It is also a liquid which you have to taste and is in a grain alcohol base. (Gave me a headache.) Chanca piedra you can get in a pill form although there is liquid and dried herbs that you can make a tea out of but Chanca piedra also had some contraindication aspects like if you have hypoglycemia (which I do so I'm not taking either one.) If you read up on the chanca piedra it sounds like it does it all for the liver and any liver dieases. Both products seem to be very powerful. What moderate discomfort did the chanca piedra give you?