Iodized salt used in the pure salt crystals were collected from a 3000 meters deep underground mine. ISO 9001-2008 Description of prodcut:Iodized salt used in the pure salt crystals were collected from a 3000 meters deep underground mine, they are 0.5mm in diameter, the purity is above 99.1% of large particles salt ,it has non-pollution, less impurity, and this salt is very pure.Ingredients: ...