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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.
Some specialty labs do provide an RBC magnesium test, which is reasonably accurate. However, itâs also important to be on the lookout for signs and symptoms of deficiency. Early signs of magnesium deficiency include loss of appetite, headache, nausea, fatigue, and weakness.