People with existing kidney problems are the most vulnerable to magnesium toxicity. In sufficiently high quantities, medicines containing magnesium can overload the kidneys, causing further damage.
Symptoms of decreased kidney function include swelling, unexplained weight loss, itchy skin, muscle cramps, insomnia, increased urination, and erectile dysfunction. Kidney damage may not be reversible, so if you or someone close to you is taking supplements or medication containing the mineral, be alert for earlier symptoms of too much magnesium and seek treatment before damage can occur.

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