I bought some a while back, to break a large gallstone. But on the first or second day of taking it, I noticed my throat (or somewhere) got very dry...and I quit.
I remember reading Hulda Clark where she may have said that it is useless to try to remove Gallstones until parasites are very much diminished...so perhaps it follows that either chanca piedra is clearing your channels, or that your earlier efforts have reduced any parasite load.