I took a lot of Gold Coin Grass from Julia Chang and talked with here several
times on the phone. She said that the GCG could break down kidney stones also or
cause gravel to pass from the kidneys, besides helping with gallstones. I did have increased low back pain when I started on some other kideny herbs. I don't remember the GCG doing that for me. Call Julia and run it by her. In the meantime, I would suggest drinking plenty of purified water.