What Is Magnesium? Deficiency, Excess and Daily Requirements

Created: 23.07.2026  ·  Last Updated: 23.07.2026  ·  Category: Internal Medicine  ·  Prepared by the Academic Hospital Web and Medical Editorial Board.

What Is Magnesium?

Magnesium is one of the essential minerals found abundantly in nature and is vital for the healthy functioning of the body.

Important Information: The use of magnesium supplements may vary depending on personal needs, existing diseases, kidney function and medications used. A physician’s evaluation should be obtained before using supplements.

You can contact us for medical evaluation about magnesium deficiency, excess magnesium levels or supplement use.

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What Is the Daily Magnesium Requirement?

  • Adult men: 400-420 mg
  • Adult women: 310-320 mg
  • During pregnancy: 350-400 mg

These requirements may vary according to age, sex and physical activity.

Where Is Magnesium Found in the Body?

The human body contains approximately 25-30 grams of magnesium.

About 60% is found in the bones, while the rest is located in the muscles, soft tissues and blood. The body cannot produce magnesium on its own; therefore, it must be obtained externally through foods or supplements.

What Are the Functions of Magnesium?

Magnesium is an essential mineral that takes part in more than 300 biochemical reactions in the body.

Among the most important functions of magnesium are energy production, proper functioning of the muscle and nervous system, and protein and DNA synthesis. It also contributes to the regulation of heart rhythm, protection of bone health and support of the immune system. Magnesium controls the contraction and relaxation of muscles and strengthens communication between nerve cells. It plays an important role in coping with stress, improving sleep quality and balancing insulin resistance. Therefore, meeting the daily magnesium requirement is very important for a healthy life.

Which Foods Contain Magnesium?

Magnesium is naturally found in many foods.

Pumpkin seeds, almonds, walnuts, cashews, hazelnuts, dark green leafy vegetables such as spinach and chard, whole grains (oats, brown rice, bulgur), avocado, legumes (chickpeas, lentils, beans), dark chocolate and bananas are among the foods rich in magnesium.

You can contact us for medical evaluation about magnesium deficiency, excess magnesium levels or supplement use.

Book an Appointment

What Is Magnesium Deficiency (Hypomagnesemia)?

It is the condition in which the magnesium level in the blood falls below normal. This condition is becoming increasingly common, especially with the stress, irregular nutrition and high caffeine consumption brought by modern life.

What Are the Symptoms of Magnesium Deficiency?

  • Muscle cramps and twitching
  • Weakness and fatigue
  • Sleep problems
  • Headache or migraine
  • Heart rhythm disorders
  • Depressive mood and anxiety

What Health Problems Can Magnesium Deficiency Cause?

Insufficient magnesium levels can prepare the ground for serious diseases over time.

  1. Muscle cramps and muscle twitching: Magnesium is necessary for muscle contraction and relaxation. Deficiency may cause muscle cramps and involuntary twitching, especially at night.
  2. Chronic fatigue and low energy: Magnesium plays a role in ATP production. Therefore, deficiency may cause weakness, exhaustion and low energy throughout the day.
  3. Sleep problems and insomnia: Magnesium has an important role in the function of neurotransmitters that affect sleep regulation. In deficiency, difficulty falling asleep and frequent nighttime awakenings may occur.
  4. Anxiety and depressive mood: Studies show a relationship between low magnesium levels and anxiety and depression. This mineral has a calming effect on the nervous system.
  5. Headache and migraine attacks: Magnesium deficiency may cause blood vessels to narrow. This may trigger migraine or increase the severity of existing headaches.
  6. Heart rhythm disorders (arrhythmia): Regular function of muscles, including the heart muscle, depends on magnesium. In deficiency, palpitations and irregular heartbeats may occur.
  7. High blood pressure: Magnesium helps blood vessels dilate and blood pressure stay balanced. Insufficiency may increase the risk of hypertension.
  8. Insulin resistance and Type 2 diabetes risk: Magnesium is involved in blood sugar metabolism. Deficiency may reduce the effect of insulin and increase the long-term risk of developing diabetes.
  9. Osteoporosis: Magnesium is as important as calcium for bone health. Inadequate intake may reduce bone density and increase fracture risk.

Get an Evaluation for Your Magnesium Level

If you have muscle cramps, fatigue, sleep problems, palpitations or questions about supplementation, medical evaluation is important.

Should Magnesium Supplements Be Used?

When sufficient amounts cannot be obtained through diet, magnesium supplements may be used with a physician’s recommendation.

What Is Magnesium Excess (Hypermagnesemia)?

Magnesium is a vital mineral for the body, but as with everything, too much can be harmful. It is usually seen in individuals with impaired kidney function or in those taking high-dose magnesium supplements.

What Are the Symptoms of Magnesium Excess?

Symptoms vary depending on the magnesium level in the blood. Mild excess usually causes no symptoms, but as levels rise, the following symptoms may occur:

  • Nausea and vomiting
  • A feeling of warmth and flushing of the skin
  • Low blood pressure (hypotension)
  • Muscle weakness and decreased reflexes
  • Respiratory depression
  • Confusion
  • In severe cases: cardiac arrest (rare)

How Is Magnesium Excess Treated?

  • Stopping magnesium supplementation
  • Supporting elimination from the body with fluid therapy
  • Dialysis if necessary, especially in patients with kidney disease
  • Close monitoring of heart and respiratory functions

Magnesium is indispensable for both physical and mental health. Deficiency of this mineral, which should be obtained through adequate and balanced nutrition, can contribute to many health problems. If you have symptoms of deficiency, it is recommended that you consult a specialist without delay.

Get an Evaluation for Your Magnesium Level

If you have muscle cramps, fatigue, sleep problems, palpitations or questions about supplementation, medical evaluation is important.

Frequently Asked Questions

How can magnesium deficiency be recognized?
Muscle cramps, twitching, weakness, fatigue, sleep problems, headaches, palpitations and depressive mood may be seen in magnesium deficiency. Physician evaluation and appropriate tests are important for a definitive assessment.
Can everyone use magnesium supplements?
No. Magnesium supplementation can be risky, especially in people with kidney disease or those who regularly use medications. It should therefore be used with a physician’s recommendation.
Which foods are richest in magnesium?
Pumpkin seeds, almonds, walnuts, cashews, hazelnuts, spinach, chard, whole grains, avocado, legumes, dark chocolate and bananas are among foods rich in magnesium.
Is excess magnesium dangerous?
Yes. Especially in individuals with impaired kidney function or high-dose supplement use, excess magnesium may cause serious conditions such as hypotension, muscle weakness, respiratory depression, confusion and, rarely, cardiac arrest.
Academic Hospital note: Symptoms of magnesium deficiency or excess can overlap with other diseases. For your complaints or questions about supplement use, you can book an appointment.

References

  1. NIH Office of Dietary Supplements. Magnesium - Health Professional Fact Sheet
  2. Cleveland Clinic. Hypomagnesemia
  3. Cleveland Clinic. Hypermagnesemia
  4. Merck Manual Professional Edition. Hypermagnesemia