Magnesium is an essential mineral needed by humans in gram amounts. In this regard magnesium intake needs to be balanced with calcium and chloride intake in order to maintain correct mineral balance between extracellular and intracellular space. One of the common symptoms of a magnesium deficiency is the development of cramps as magnesium is needed for muscle relaxation. If such cramps occur in cardiac muscle then a heart attack could occur. Generally only a severe magnesium deficiency can cause a heart attack, but studies show that administration of magnesium to patients who have suffered a heart attack can significantly increase their chance of survival. Obtaining high amounts of magnesium in the diet is therefore pivotal to health and generally, green leafy vegetables are a good source of magnesium. If additional magnesium is required, perhaps because calcium intakes are high, then a supplement of magnesium, such as magnesium oxide can be taken to increase total magnesium intake.
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