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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.
More common side effects from magnesium include upset stomach and diarrhea. Magnesium competes with calcium for absorption and can cause a calcium deficiency if calcium levels are already low. Some medications may lower magnesium levels in the body. These include: 1  Chemotherapy drugs.