If you take "White Oak Bark" daily, you won't get gall stones or kidney stones..it is an herb...once you get the stones, however, it will not work. It needs to be taken daily to prevent them...When you lose weight that fast, it does up your chances for gall stones...A lady at a health food store told me about it, and she said people who have suffered from stones (both kinds) and who have started taking the herb, have not had stones since...it's worth a try....I get banded in a few days and I have started taking it just in case...I do not want gall stones!! good luck!