Can You Overdose on Magnesium?
Magnesium is a mineral that’s found naturally in many foods and in your body. However, as with most things, there are dangers associated with getting too much. Magnesium overdose is technically known as hypermagnesemia. It occurs when there is too much magnesium in your blood. It can occur in people with chronic health conditions, although it’s rare. Magnesium overdose may also result from taking too much of a supplement or medication containing magnesium.
So how does this mineral work, and what happens when you get too much of it?
Magnesium serves many functions in the human body. It’s important for:
- protein synthesis
- healthy bone formation
- regulating blood pressure
- maintaining heart health
- energy production
- nerve function
- blood sugar control
If you take supplemental magnesium, the most you should ingest is 350 mg daily. However, magnesium may be prescribed to prevent migraine headaches, with a daily dosage of more than 350 mg a day. These dosages should only be taken with medical supervision.
Magnesium is found in a variety of foods, especially those with a lot of fiber. Nuts, leafy greens, legumes, and whole grains are among the best sources. Some specific foods that are high in magnesium include:
- almonds
- spinach
- cashews
- peanuts
- wheat cereal or bread
- soymilk
- black beans
- peanut butter
For example, it’s the first ingredient in some laxatives. While these medications may have a high amount of elemental magnesium, it normally isn’t dangerous. Because of the laxative effect, you don’t absorb all of the magnesium. Instead, it’s flushed from the body before it has a chance to have much impact. Magnesium is also present in some medications for acid, indigestion, or heartburn.
Learn more: 10 foods high in magnesium »
Hypermagnesemia is rare because the kidneys work to get rid of excess magnesium. Overdose is most often seen in people with kidney failure after they take medications containing magnesium, such as laxatives or antacids.
It’s because of this risk that people with kidney disease are cautioned against taking magnesium supplements or medications that contain this mineral. The risks are also higher for people with heart disease and gastrointestinal disorders.
According to the Office of Dietary Supplements, symptoms of magnesium overdose may include:
- diarrhea
- nausea and vomiting
- lethargy
- muscle weakness
- irregular heartbeat
- low blood pressure
- urine retention
- respiratory distress
- cardiac arrest
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