Nutritional trace element which is essential for many vital functions, including the synthesis of thyroid hormones and infant neurodevelopment (Leung 2011). A deficiency affects thyroid function and cognitive performance. Iodine is a normal component of breastmilk (Leung 2011). Iodine supplementation increases iodine concentration in the nursing mother and breastmilk (Seibold-Weiger 1999, Mulrine 2010, Sukkhojaiwaratkul 2014, Huynh 2016). In many regions of the world, including areas with high level of development, there is an iodine deficiency in humans, especially, among pregnant and nursing mothers. The addition of iodine to culinary salt is the most efficient way to prevent iodine deficiency in large populations, but according to countries and areas, it may be necessary to administer iodine supplements to pregnant and lactating mothers (Caron 2006, Donnay 2014, Nazeri 2015). Recommended daily allowance from 100 to 150 micrograms for normal population that may be increased up to 250-300 micrograms during pregnancy and lactation, so most experts and health organizations recommend supplementation between 100 and 200 micrograms per day, depending on regions (Caron 2006, Mulrine 2010, Stagnaro-Green 2011, Leung 2011, Mackerras 2012, Donnay 2014).