Can anyone recommend a good Chanca Piedra / stone breaker product?

Rain-tree have outlets listed on the following link:

http://www.rain-tree.com/product.htm#.U-XPfGd0yHs

I typed "Chanca Piedra 100 Vegetarian Capsules 500 mg" into a well known search engine and it found the product on amazon, in stock. I have checked for tincture or bulk herb.

The dose details are found on this link:

http://www.rain-tree.com/chanca.htm#.U-XRxWd0yHs

Dose: Infusion: 1 cup 2-3 times daily, Fluid Extract: 2-4 ml 2-3 a day, or Capsules: 1-2 g twice daily

Chanca Piedra is favoured for the expulsion of kidney stones. It is also a liver detox and support product but not a gallstone expulsion herb. It is similar to Milk Thistle which has good medical evidence for repairing the liver.