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 support, digestion, bone health, and promote a sense of calm. Double Woods Magnesium Chloride (Cloruro de Magnesio) is encapsulated and tested in the USA in a cGMP facility. Product by Doublewood – Non-Gmo and Gluten Free: Double Woods Magnesium Chloride is Non-GMO and Gluten Free – Max % Elemental Magnesium; Double Woods Magnesium Chloride is approximately 12% Magnesium by weight and this far exceeds other types of Magnesium – Manufactured in the USA from Globally Sourced Ingredients; Our Magnesium Chloride is Manufactured and Tested for safety in the USA – Optimize your Magnesium Levels; Daily supplementation with Magnesium Chloride can help optimize your Magnesium levels – Supports Bone Health and Digestion; Magnesium Chloride supports bone health as you age