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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.
Some minerals will make it harder for your body to absorb magnesium. You should avoid taking mineral supplements at the same time that you take your magnesium supplement. In particular, either an excess or a shortage of calcium in your body can make it harder to absorb magnesium. While taking magnesium supplements, avoid excess calcium.