Double Fortified Salt (DFS) is an innovative new fortified food product - delivering small but crucial amounts of iodine and iron to human beings through their diet. In general, DFS formulations are intended to provide 100% of daily dietary iodine requirement, and 30 to 60% of daily dietary iron requirement
DFS is produced by mixing iodized salt with either/or ferrous sulphate/ encapsulated ferrous fumarate. While producing DFS with ferrous sulphate, sodium hexametaphosphate (SHMP) is used as a stabilizer, ferrous fumarate has been encapsulated with soya stearin to prevent interaction between iodine and iron. DFS as a product is stable in both formulations, is indistinguishable in taste, color, and smell from regular salt and has been proved efficacious in addressing IDA (Iron Deficiency Anemia) and IDD (Iodine Deficiency Disorder).
The salt iodization process involves very little technology of using a drip feed equipment to dose potassium iodate (KIO3) solution to the raw salt to a very sophisticated dewatering, drying and packing system. DFS technology can be easily integrated with little modifications in existing iodized salt processing facilities by adding a ribbon blender to blend the iron compound to iodized salt to produce DFS.
Given limited commercialization of the product, the incremental cost per kilogram of salt on account of addition of iron remains unclear. However it is anticipated that the increase in cost of DFS could be 20-50% higher than iodized salt per kilogram.