2 oz. bottle. Yellow dock is used for pain and swelling (inflammation) of the nasal passages and the respiratory tract, and as a laxative and tonic. It is also used to treat bacterial infections and sexually transmitted diseases. Yellow dock is also sometimes used to treat intestinal infections, fungal infections, and arthritis. Yellow dock is considered one of the best herbs for the entire digestive system. The taproot is rich in anthraquinone, which has a laxative action. It contains biochelated iron, which can be readily absorbed. It is helpful for anemia, fatigue, and for folks with PMS or other hormonal imbalances.