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However, too much magnesium from nonfood sources, such as magnesium salts, has been shown to cause mild to severe toxicity. Symptoms can range from diarrhea, nausea and abdominal cramps to difficulty breathing, extremely low blood pressure and irregular heartbeat.
Late Stages. As iron builds up in the organs, symptoms begin to get more severe. Depending on the severity of the overdose, the severe symptoms may occur anywhere between 12 hours and 5 weeks after taking too much iron. People can begin to have seizures, a decrease in blood sugar levels and a fever.