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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.
What happens if I have too much calcium? Increased calcium intake for a limited period of time does not normally cause problems. However, higher amounts of calcium over a long period of time can cause constipation, and increases the risk for kidney stones in some people.