Mang Xiao or Xuan Ming Fen (Natrium sulfuricum) is also known as sodium sulfate. The salty, bitter and cold herb has been used in TCM totreat constipation with dark urine, fullness, pain in abdomen,  conjunctivitis, boils in mouth and tongue, etc., as it softens what is hard, eliminates Heat, etc., by enhancing the functions of …