Magnesium overdose

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Rare but serious

Hardly any mineral is as important for our body as magnesium. A magnesium overdose or hypermagnesemia is rather rare. However, many people suffer from a magnesium deficiency. Dietary supplements can be useful for treating a magnesium deficiency, but if taken excessively and under certain conditions, too much magnesium can be dangerous.

Avoid magnesium overdose

The human body could not function without magnesium. It ensures that we have enough energy every day by supporting our nervous system, energy metabolism and muscle function, among other things. But how can you avoid overdosing?

By knowing your recommended daily requirement. The German Nutrition Society uses the following guideline values for the daily magnesium requirement of an adult over the age of 25:

Glückliches Paar
  • Men: 350 mg

  • Women: 300 mg

  • Pregnant women: 310 mg

  • Breastfeeding women: 390 mg

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Can too much magnesium be harmful?

Zu viel Magnesium kann schädlich sein

Even in the case of a proven magnesium deficiency, magnesium supplements should never be taken excessively, because above a certain amount, too much magnesium is harmful.

If a person's magnesium requirement is exceeded, the kidneys ensure that the body excretes the excess magnesium through the urine. As a rule, therefore, a slight magnesium overdose is harmless. In addition, there are usually no symptoms, so the mild magnesium overdose often goes unnoticed.

A long-term magnesium overdose of 300 mg daily may result in diarrhea or other gastrointestinal symptoms. In this case, you should lower the magnesium dosage or pause the intake. If 2500 mg or more are taken daily, a magnesium overdose becomes dangerous: Possible consequences are a drop in blood pressure or muscle weakness. In certain cases, too much magnesium can even cause cardiac arrhythmias. Just as too little magnesium is bad for the heart, so is too much magnesium.

However, side effects may also occur despite compliance with the recommended reference values of magnesium. Typical are flatulence, fatigue or dizziness. In most cases, however, the body must first slowly get used to the recommended dose.

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Hypermagnesiämie durch Krankheit

In seltenen Fällen ist der Magnesiumgehalt im Körper auch krankheitsbedingt erhöht. Der Ursprung einer Hypermagnesiämie liegt in einer Funktionsstörung der Nieren. Diese können das Magnesium nicht mehr erfolgreich ausscheiden. Zu Beginn haben die Betroffen meist keine Symptome. Übersteigt der Magnesiumspiegel im Blut jedoch einen bestimmten Wert, bemerken die Betroffenen zunächst das Versagen der Sehnenreflexe. Dann muss schnell gehandelt werden. Wird eine schwere Form der Hypermagnesiämie nicht behandelt, kann die Krankheit lebensgefährlich werden.

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