Magnesium chloride (MgCl2) is one form of magnesium that is permitted to be used in foods, including dietary supplements. Magnesium chloride powder is also popular for making magnesium oil for use on the skin or in magnesium baths. It dissolves easily and completely in purified water. Magnesium is a mineral that is� crucial� for the functioning of the body, as it contributes to the functioning of the� nervous system and muscles, as well as the release of energy during metabolism and maintaining healthy bones. It is the fourth most common cation in the human body; 30% of it is found in the muscles and 60% in the skeleton.