Chanca piedra UK - where to buy?

Hi,

I currently have liver/pancrease issues.
Have done several flushes now, and although stones and
parasites (i think - many little red things!) have come out, I have not had many.
Pioneer1 kindly recommended me to get Chanca piedra
to help break stones with my liver flushes.
So can someone please recommend where I can buy this in
the UK?

Many thanks all,
and God Bless. Tweet