The Hulda Clark liver flush is not dangerous if you stick to the receipe. There is a possibiltity of getting a stone stuck but only if you don't follow the receipe. Some like to dissolve the stones first then there is no way the stone will get stuck. As for killing parasites first, it is not mandatory. Go to the Liver Flush forum and read what Shellycat, flowergirl or hopinso has to say. Very informative.