what is the side effects of magnesium supplements – 5 Proven Side Effects Of Too Much Magnesium!

Most people seeking to add magnesium to their diet resort to supplementation but how safe is magnesium supplement, does it have any after use side effect? what is the side effects of magnesium supplements?

Doctors have agreed that magnesium, when taken according to recommended dosage by a health worker, is relatively safe.

You know that magnesium is very important as it helps in carrying out over 300 biochemical reactions vital to the body, functions such as digestion, helps calm nerves, increase energy, etc, everyone would want to have it sufficient enough to keep those functions going on smoothly.

Because of how important and central magnesium is in carrying out many biochemical reactions in the body, deficiency of it(hypomagnesemia) could result in some health challenges such as muscles cramps, irregular heartbeat, seizures and so many other complications.


Because of the many health implications of hypomagnesemia, Doctors recommend a daily supplementation and food rich in Magnesium. This is not far from the fact that many people are facing health crises because of deficiency of Magnesium.

In the USA alone, a report has it that over 80% of Adult Americans are deficient in Magnesium. To worsen the situation, many cases are often not diagnosed for lack of blood symptoms. Only about 1% of magnesium deficiency appear in a blood test, says the report.


Food Source Of Magnesium.

what is the side effects of magnesium supplements

Apart from Magnesium supplement, it can also be gotten from food sources such as

  • Potatoes.
  • Pumpkin Seeds.
  • Cashew.
  • Spinach.
  • Beans(Black).
  • Almonds.
  • Lentils.
  • Sesame seeds.
  • Broccoli.
  • Brussels Sprouts.
  • Fish and Seafood like Crab, Mackerel, Salmon, Pollock, Salmon, etc.
  • Munga Beans.
  • Avocado.
  • Bananas.
  • Swiss Chard, etc.

But for some reasons, some people might not be able to get enough magnesium from the above-listed sources and the next available options would be to take Magnesium Supplements. There are a good number of Magnesium supplements that would suit your body and pocket.

Side Effects Of Taking Too Much Magnesium Supplements.

For the better part, magnesium gotten from food sources can hardly pose any significant health challenge as the kidney work to pass out any extra or unused through urine and sweat, and for that magnesium toxicity is rare.

However, through Magnesium Supplements, though rare, it is, however, possible to have too much magnesium accumulated in the body to a toxic level and that can add up to pose some serious health risk.

Overall, Doctors agree that a reasonable dose of less than 350 mg daily is safe, but anything over that could be unsafe as it could potentially add up to a toxic level.

Here are some of the health dangers of having hypermagnesemia, or magnesium overdose in the body.

  • Weakened Kidney.

what is the side effects of magnesium supplements

Excess intake of Magnesium Supplement means the kidney will have to work at almost a double pace in order to get ride of the overdose, unfortunately, this will have to come with a high cost, an overworked kidney.

When symptoms like swelling of the feet, ankles, and legs, nauseating and vomiting began to appear, you might be at the risk of having kidney problem resulting from an over-worked Kidney.

People that are already suffering from kidney problem can have a serious problem clearing the excess magnesium in the system.

You can see a Doctor to discuss the symptoms and find ways of solving it. Your Doctor can proffer an immediate solution to that.


  • Irregular Heart Beat.

what is the side effects of magnesium supplements

One of the many resultant effects of too much magnesium is an irregular heartbeat. Generally, magnesium from food sources hardly have any negative effect as the body can work to control it and expel any excess, but when supplemental magnesium is taken above 350 gm daily for a longer period of time, the build-up could cause magnesium toxicity, and magnesium toxicity can cause problems like irregular heartbeat and slowed breath.

Apart from an irregular heartbeat, there have been reported cases of people having slowed breath attributed to taking excess supplemental magnesium over an extended period of time.



  • Excessive Bleeding.

Magnesium is said to increase the amount of bleeding and decreases the ability of the blood to cloth especially in people suffering from the bleeding problem, according to Doctors at WebMD.

Taking too much Magnesium Supplements means adding more problem to the already existing one and that could be life-threatening to some extent.


  • Low Blood Pressure.

what is the side effects of magnesium supplements

Although it occurs, the toxicity of magnesium resulting from an overdose is not common, but when it does, it comes with significant side effects including low blood pressure.

Supplemental Magnesium has been found to be guilty of magnesium toxicity that results into many health complications including a sharp drop in the blood pressure of the patient.

Low blood pressure, medically also known as hypotension is said to occur when the blood pressure in the arteries is unusually low. The range varies from person to person as what others consider as low blood pressure might actually be a normal or higher blood pressure with you.

Those already having symptoms of low blood pressure, it will be good if they avoid magnesium supplements altogether and if they must take, it should as prescribed by a Doctor.

  • nausea and vomiting.

In some people, magnesium overdose can cause significant side effects including nausea and vomiting. Nausea comes accompanied by other health abnormalities like dizziness, dry mouth, diarrhea, fever, abdominal pain, vomiting, stomach upset etc.

According to Office of Dietary Supplements, any dosage exceeding the recommended 420 mg for men above 30 years and 32omg for women within the same age range, anything above that could cause magnesium toxicity.

The USA Office of dietary supplements listed other likely symptoms of magnesium overdose to include diarrhea, abdominal cramping, muscles weakness, lethargy, retention of urine, etc.

According to scientist at NIH, the most type of magnesium overdose likely to cause toxicity are: magnesium carbonate, chloride, gluconate, and oxide


How Much Magnesium Is Safe.

To be safe from magnesium toxicity, National Institute Of Health say the Recommended Daily Allowance for a male adult is 400-420 mg while an adult female can take 310-320 mg.

Pregnant females can take 350-360 mg daily while females that are breastfeeding can take a daily dose of 310-320 mg. when this dose is judiciously maintained, the risk of overdose is reduced.



  1. http://www.express.co.uk/life-style/health/832845/magnesium-supplement-food-mineral-overdose-hypermagnesemia-cardiac-arrest-diarrhea.
  2. https://www.webmd.com/vitamins-supplements/ingredientmono-998-magnesium.aspx?activeingredientid=998.
  3. https://www.psychologytoday.com/blog/evolutionary-psychiatry/201106/magnesium-and-the-brain-the-original-chill-pill.
  4. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/#h4.

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