Too much magnesium may cause diarrhea and abdominal cramps. In severe cases, it can lead to difficulty breathing, irregular heartbeat, and death. Severe magnesium toxicity is not all that common.

Not everyone needs a magnesium supplement—most people can meet their needs through food. But if you do take one, be aware of the potential side effects: Diarrhea is common, and in rare cases, excess ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." While true magnesium deficiency is rare, per NIH, research suggests that we may not be getting as much of ...