<prompt> Twin foified salt contains:Iodine FluorineIodine CalciumIodine IronIodine Chlorine  <response>: National Institute of Nutrition Hyderabad developed Twin Foified Salt also known as Double Foified Salt DFS to prevent iron iodine deficiencies. DFS - contains Iron and Iodine contains salt, Potassium Iodinate, Ferrous sulphate and sodium hexa metaphosphate. provides 40 mcg Iodine and 1 mg Iron per gram of salt. 