Herbal Support for Kidney and Gallbladder Herbal Supplement Formulated by Michael Tierra L.Ac, O.M.D Planetary Herbals Stone Free is a unique combination designed to support the kidneys, liver and gallbladder. Dandelion root and turmeric root are bitter substances that can support the body's normal bile flow. Parsley root and marshmallow root have been used historically for supporting normal fluid elimination. Created for Planetary Herbals by licensed acupuncturist and clinical herbalist Michael Tierra. A clinician since 1972, Michael is an authority on the world's herbal traditions, and has authored several respected herb books.