Calcification of the Arteries
Although this is not the first indication of magnesium deficiency, it can be one of the most dangerous.
Magnesium can inhibit the accumulation of calcium in the arteries. Calcification of arteries and arterioles from low magnesium levels can cause heart problems like heart attack, infectious heart disease, and heart failure. The ability of magnesium to prevent over-calcification of the arteries is one of the reasons why many studies found that consuming adequate magnesium correlated with a reduced risk of coronary heart diseases.
Of note, about half of all heart attack patients receive magnesium chloride injections to help stop calcification and blood clotting.