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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.
Can zinc be harmful? Yes, if you get too much. Signs of too much zinc include nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. When people take too much zinc for a long time, they sometimes have problems such as low copper levels, lower immunity, and low levels of HDL cholesterol (the good cholesterol). The upper limits for zinc are listed below.