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Photo Credit shih-wei/iStock/Getty Images. Magnesium is a naturally occurring element that people need as a key nutrient. The human body relies on magnesium for various purposes, and people who don't have enough can suffer various symptoms, through dry, itchy skin is not considered one of them.
Although you may not get enough magnesium from your diet, it is rare to be deficient in magnesium. However, certain medical conditions can upset the body's magnesium balance. For example, an intestinal virus that causes vomiting or diarrhea can cause a temporary magnesium deficiency.