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Can You Take Too Much Magnesium?

Published in Magnesium Safety 2 mins read

Yes, you can take too much magnesium.

Understanding Magnesium Overdose

While magnesium is an essential mineral for bodily functions, exceeding the recommended daily intake can lead to health problems. The risk of magnesium overdose primarily comes from supplements, as magnesium from food sources is generally less of a concern.

When Magnesium Becomes Unsafe

According to WebMD, magnesium is POSSIBLY UNSAFE when taken in very large amounts, specifically greater than 350 mg daily. This is especially true when the magnesium comes from supplements, as dietary magnesium is typically well-regulated by the body.

Symptoms of Magnesium Overdose

Excessive magnesium intake can cause a range of serious side effects:

  • Irregular Heartbeat: A disturbance in the normal rhythm of the heart.
  • Low Blood Pressure: A decrease in blood pressure that can lead to dizziness or fainting.
  • Confusion: Difficulty thinking clearly or experiencing disorientation.
  • Slowed Breathing: A dangerous decrease in the rate of respiration.
  • Coma: A state of deep unconsciousness.
  • Death: In severe cases, magnesium overdose can be fatal.

Preventing Magnesium Overdose

To avoid the risks associated with excessive magnesium intake:

  • Consult a Healthcare Professional: Before starting any magnesium supplements, talk to your doctor to determine if they are necessary and what dosage is safe for you.
  • Follow Recommended Dosages: Adhere to the daily recommended intake of magnesium, which varies depending on age, sex, and health conditions.
  • Read Supplement Labels Carefully: Pay attention to the amount of magnesium in supplements and be mindful of combining different supplements that may contain magnesium.
  • Focus on Dietary Magnesium: Prioritize magnesium intake through whole foods, such as leafy greens, nuts, seeds, and whole grains.

Table: Magnesium Safety

Condition Safety Level Notes
Dietary Magnesium Generally Safe The body usually regulates dietary magnesium well.
Supplement Magnesium Possibly Unsafe Amounts greater than 350 mg daily are concerning.


Therefore, while magnesium is vital for health, excessive intake, particularly from supplements, can lead to serious adverse effects. Always consult a healthcare provider before starting magnesium supplementation.

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