yes, the Chanca Piedra was from U.K.., and the same Product as from www.rain-tree.com.
I read a lot about Julia Chang's Herbs, and found that in some cases of extreme constipation of the liver, it is better to start with Gold Coin Grass. The GCG breaks down the stones, the Bitters increase the flow of bile. I can imagine if you increase the flow of bile with to constipated bile ducts, you can suffer from bad symptoms. Maybe you try the GCG?
And I will start with a microdose of GCG and see what happens.