Magnesium chloride is a pure natural polymineral (pure bischofite is slightly yellowish; with salt impurities, it can range from transparent to brown), which contains a sodium-magnesium chloride complex with iodine, bromine, iron, silicon, molybdenum and other nutrients. It is mined from an ancient seabed at a depth of 7325 ft in the Poltava region of Ukraine, in brine form, and delivered in a plastic container as flakes that dissolve in water for mineralisation
