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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.
Too Much Calcium. You don't need to worry about getting too much calcium from food, but you might consume too much if you take supplements. In addition to its role as an electrolyte -- which supports nerve function -- calcium aids in cell communication and keeps your bones strong. Too much calcium, though, and you might face a higher risk of kidney stones.