Magnesium: Benefits, Uses, and Limitations of an Essential Mineral
Laura Chrobok 17.06.2026
Magnesium is one of the most widely used dietary supplements in the world. It is commonly recommended for muscle cramps, stress, fatigue, sleep problems and migraine. At the same time, countless claims circulate regarding its effects. But what can magnesium actually do — and where might expectations be set too high?
In this article, we take a closer look at the scientifically established effects of magnesium and explain why this mineral is indispensable for the human body.
What Exactly Is Magnesium?
Magnesium is a mineral. Minerals are essential nutrients that the body cannot produce on its own and must therefore obtain regularly through food. They are required for numerous bodily functions, including muscles, nerves, bones and energy metabolism. Magnesium is one of the best-known members of this nutrient group, of which iron and zinc are two other famous members.
Foods particularly rich in magnesium include:
o pumpkin seeds
o sunflower seeds
o almonds
o cashew nuts
o oats
o whole grains
o legumes
o green leafy vegetables
o cocoa
(National Institutes of Health, 2024).
What Are the Functions of Magnesium in the Human Body?
Magnesium is involved in hundreds of metabolic processes and is found in virtually every cell of the body.
It has been shown to contribute to:
· normal muscle function
· normal functioning of the nervous system
· normal energy-yielding metabolism
· normal psychological function
· the reduction of tiredness and fatigue
· the maintenance of normal bones
· the maintenance of normal teeth
(EFSA NDA Panel, 2010).
What Are Typical Signs and Consequences of Magnesium Deficiency?
Inadequate magnesium intake may contribute to:
· muscle twitching
· muscle cramps
· fatigue
· weakness
· nervousness
· loss of appetite
· nausea
· cardiac arrhythmias
(Gröber et al., 2015).
However, it is equally important to note that not every muscle cramp and not every form of fatigue is automatically caused by magnesium deficiency.
Does Magnesium Really Help with Muscle Cramps?
Muscle cramps are among the most common reasons why people take magnesium supplements.
Although magnesium is essential for normal muscle function, the scientific evidence regarding muscle cramps is less clear-cut than many advertisements suggest.
A Cochrane review concluded that magnesium is unlikely to provide a clinically meaningful benefit for idiopathic muscle cramps in older adults (Garrison et al., 2020).
This does not mean that magnesium is useless, but rather that it does not automatically eliminate the cause of every muscle cramp.
Can Magnesium Help Prevent Migraine?
Magnesium has been studied in relation to migraine for many years.
A systematic review concluded that magnesium represents a plausible and scientifically investigated option for migraine prevention (von Luckner & Riederer, 2018).
Magnesium is not a substitute for medical treatment. Nevertheless, it is one of the dietary supplements that has been studied more extensively for migraine than many other natural approaches.
Does Magnesium Really Promote Relaxation?
Magnesium is often referred to as an “anti-stress mineral”.
It does contribute to normal nervous system function and normal psychological function (EFSA NDA Panel, 2010). For this reason, many people take magnesium in the evening to support relaxation. However, individuals who already have an adequate magnesium status will not automatically experience less stress than others. A magnesium deficiency, on the other hand, may impair normal bodily functions.
Which Form of Magnesium Is Best?
There is no universally best form of magnesium. Different magnesium compounds vary in their magnesium content, intestinal absorption and tolerability. The most suitable form therefore depends on the individual's goals and personal tolerance.
Commonly used forms include:
· Magnesium citrate, which is considered highly bioavailable and is widely used in dietary supplements.
· Magnesium glycinate, which combines magnesium with the amino acid glycine and is often described as being well tolerated.
· Magnesium oxide, which contains a relatively high amount of elemental magnesium but is absorbed less efficiently and may be more likely to cause diarrhoea.
· Magnesium malate, which combines magnesium with malic acid and is also commonly available.
· Magnesium chloride, which is used both in dietary supplements and in some magnesium oils.
Scientific studies suggest that organic forms such as magnesium citrate are generally absorbed better than certain inorganic forms such as magnesium oxide (Walker et al., 2003).
However, bioavailability alone is not the deciding factor. Dosage, tolerance, diet, health status and individual needs also play important roles. Someone who experiences diarrhoea with one magnesium preparation may tolerate a different magnesium compound much better. Therefore, there is no single “best” magnesium form for everyone.
What Can Magnesium Not Do?
Magnesium is important — but it is not a miracle cure.
It cannot:
· explain every case of fatigue
· prevent every migraine attack
· eliminate every muscle cramp
· reliably solve sleep problems
· simply “remove” stress
· replace a balanced diet.
Precisely because magnesium is so important, its proven effects should be distinguished from exaggerated marketing claims.
Conclusion: The Magnesium Hype Has Some Justification …
… but not every claim made about magnesium stands up to scrutiny.
Those who take a realistic view of magnesium will not find a miracle mineral — but they will find an indispensable nutrient that supports many important bodily functions.
Magnesium is among the most important minerals in the human body. Its role in muscle function, nervous system function, energy metabolism and the reduction of tiredness and fatigue is supported by scientific evidence.
FAQ — (Further) Frequently Asked Questions About Magnesium
1. Is It Possible to Take Too Much Magnesium?
Yes, high doses from dietary supplements (more than 250 mg according to the EFSA) may cause diarrhoea, nausea or gastrointestinal discomfort. People with kidney disease should only take magnesium supplements after consulting a healthcare professional.
2. Why Do Some Magnesium Supplements Cause Diarrhoea?
Not every magnesium compound is absorbed equally well. Excess magnesium can draw water into the intestines, producing a laxative effect. Magnesium oxide is particularly known for this.
3. Can Magnesium Supplements Interact with Medications?
Yes, magnesium may affect the absorption of certain medications, including some antibiotics and medications used to treat osteoporosis. For this reason, an adequate time interval between doses is often recommended. The information provided in the package leaflet and by physicians or pharmacists should always be followed.
Further information about the effects of minerals and many other topics can be found not only on our blog, but also in our “Medizinskandale” book series and the “Codex Humanus.” The fifth volume is out now, feel free to visit our online shop.
Sources:
· National Institutes of Health (NIH), Office of Dietary Supplements (2024): “Magnesium – Fact Sheet for Health Professionals.”
· EFSA Panel on Dietetic Products, Nutrition and Allergies (2010): “Scientific Opinion on the Substantiation of Health Claims Related to Magnesium,” EFSA Journal.
· Gröber, U., Schmidt, J. & Kisters, K. (2015): “Magnesium in Prevention and Therapy,” Nutrients.
· Garrison, S. R. et al. (2020): “Magnesium for Skeletal Muscle Cramps,” Cochrane Database of Systematic Reviews.
· von Luckner, A. & Riederer, F. (2018): “Magnesium in Migraine Prophylaxis—Is There an Evidence-Based Rationale? A Systematic Review,” Headache.
· Walker, A. F. et al. (2003): “Mg Citrate Found More Bioavailable Than Other Mg Preparations in a Randomised, Double-Blind Study,” Magnesium Research.