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A low level of magnesium in the blood is hypomagnesia. Magnesium is an electrolyte that you get from the foods you eat. It helps keep normal activity in your nerve and muscle cells. It is important to your heart and bones. Magnesium is needed to help your body make certain hormones. It helps maintain your blood sugar and blood pressure levels. Low magnesium levels can lead to low calcium or potassium levels as well.

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