Magnesium dichloride is a magnesium salt comprising of two chlorine atoms bound to a magnesium atom. It is a magnesium salt, an inorganic chloride and a magnesium halide.Magnesium chloride. An inorganic compound consisting of one magnesium and two chloride ions. The compound is used in medicine as a source of magnesium ions, which are essential for many cellular activities. It has also been used as a cathartic and in alloys.

1. Curing agent; nutritional fortifier; flavoring agent (used in combination with magnesium sulfate, salt, calcium hydrogen phosphate, calcium sulfate, etc.); fermentation aid for Japanese sake; water-removing agent (used in fish cakes at 0.05%–0.1%); texture modifier (used with polyphosphates as an elasticity enhancer for surimi products). Due to strong bitterness, the usual dosage is less than 0.1%.

2. Wheat flour treatment agent; dough quality improver; oxidizing agent; canned fish modifier; malt saccharification treatment agent.