Magnesium Chloride is a naturally occurring compound composed of two chloride ions and one magnesium ion. It is extracted from either brine or ocean water. It is 12% magnesium by weight. This is similar to many other types of magnesium. For example, Magnesium Threonate is 9% by weight, Taurate is 11%, Oxide is 4 percent, and Glycinate is 14% elemental magnesium. It can organically support sleep, digestion, bone health, and promote a sense of calm. Double Wood's Magnesium Chloride (Cloruro de Magnesio) is made in the USA in a cGMP facility. Product by Doublewood