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Magnesium Deficiency: Symptoms, Causes and How to Fix It
Why Magnesium Deficiency Is So Common and Often Invisible
Magnesium is the fourth most abundant mineral in the human body and participates in more than 300 enzymatic reactions: from energy production (ATP) to protein synthesis, nerve transmission, muscle contraction, blood pressure regulation, and glucose metabolism. Virtually every body system requires magnesium to function properly.
Yet magnesium deficiency is one of the most widespread and underestimated nutritional gaps in the Western world. Epidemiological estimates suggest that a significant proportion of the European and North American population does not reach the recommended daily intake (300–400 mg for adults). The paradox is that most people don't know it: routine blood tests measure magnesium in the blood plasma, but only 1% of total body magnesium is found there. The body draws the mineral from muscles and bones to keep plasma levels stable — masking a real, potentially significant deficit.
The result is that many people live with subclinical magnesium deficiency without being aware of it, attributing symptoms to stress, age, or ordinary tiredness.
Symptoms of Magnesium Deficiency: What to Recognise
Signs of insufficient magnesium intake rarely appear in isolation. They tend to appear in combination and, precisely for this reason, are easily misinterpreted. Here are the main ones.
Chronic Fatigue and Lack of Energy
This is the most frequent symptom and often the first to appear. Magnesium is an indispensable cofactor for ATP production — the molecule that powers every cellular process. Without adequate magnesium, the Krebs cycle (the main mitochondrial energy production mechanism) becomes less efficient. The resulting fatigue is not the normal exhaustion after physical effort: it is a feeling of tiredness even in the morning, difficulty concentrating, and reduced recovery capacity after exercise.
If you wake up already tired or have low energy regardless of how much you sleep, magnesium deficiency is one of the first hypotheses to consider.
Muscle Cramps and Spasms
Nocturnal leg cramps are one of the most classic and recognisable signs of magnesium deficiency. The mechanism is precise: magnesium acts as a natural calcium antagonist in muscle contraction. When calcium enters the muscle cell, the muscle contracts; magnesium facilitates its exit and allows relaxation. In the absence of sufficient magnesium, the muscle remains in a state of hyperexcitability and tends to contract involuntarily and painfully.
In addition to nocturnal cramps, magnesium deficiency can manifest as eyelid twitching, spontaneous muscle contractions, and a feeling of stiffness. A 2020 Cochrane review analysed 11 trials on magnesium supplementation and muscle cramps, finding moderate evidence in favour of magnesium, particularly for pregnancy-associated cramps.
Anxiety, Irritability, and Difficulty Relaxing
Magnesium plays a fundamental role in regulating the nervous system. It acts at two main levels: it modulates GABA receptors (the main inhibitory receptors of the central nervous system, those that produce the feeling of calm) and blocks NMDA receptors (excitatory). When magnesium levels fall, the balance shifts towards excitation: the nervous system becomes more reactive and harder to "switch off." The practical result is a constant sense of tension, irritability, and difficulty letting go of thoughts.
People with magnesium deficiency often describe a feeling of being "always on alert" even when there is nothing to worry about. This is exactly the profile of a nervous system with too little magnesium available.
Disturbed Sleep and Night Waking
Closely connected to the above: an overexcited nervous system does not easily switch off in the evening. Magnesium deficiency interferes with sleep in multiple ways — it makes falling asleep difficult, causes frequent waking, and reduces sleep depth. Furthermore, magnesium is a necessary cofactor for melatonin synthesis (the sleep hormone): a deficiency reduces endogenous melatonin production, disrupting the circadian rhythm.
→ Read more: Magnesium for Sleep — What the Science Says
Palpitations and Irregular Heartbeat
Magnesium is essential for the electrical stability of the heart. It participates in the regulation of ion channels in cardiac cells and helps maintain regular rhythm. Its deficiency can manifest as palpitations, sensation of accelerated or irregular heartbeat, especially in the evening hours or during stressful moments. In these cases it is important to consult a doctor to rule out cardiac causes before attributing the problem solely to magnesium deficiency.
Frequent Headaches and Migraines
The correlation between low magnesium levels and migraine has been documented for decades of research. Magnesium has vasodilatory effects and influences serotonergic transmission — both mechanisms relevant to migraine. Some international guidelines include magnesium supplementation among the prophylaxis options for people who suffer from frequent migraines.
Bone Weakness and Fragility
Magnesium is involved in calcium metabolism and bone mineralisation. A prolonged deficit contributes to bone density loss, in synergy with vitamin D deficiency. People with low magnesium intake have a higher long-term risk of osteoporosis.
Who Is Most Exposed to the Risk of Deficiency?
Not everyone has the same requirement and not everyone has the same risk of deficiency. Some categories are particularly vulnerable:
Those Following a Standard Western Diet
The modern diet is poor in the main sources of magnesium: whole grains, legumes, green leafy vegetables, nuts. It is rich instead in ultra-processed foods, refined flours, and sugars, which not only contain no magnesium but increase its renal excretion. The refining of wheat eliminates up to 80% of the original magnesium.
Those Under Chronic Stress
This is one of the most underestimated mechanisms. Chronic stress activates the hypothalamic-pituitary-adrenal axis and increases cortisol levels, which in turn increases urinary magnesium excretion. But there is also a vicious cycle: magnesium deficiency amplifies the stress response and makes it harder to "bring down" elevated cortisol. Those who are always stressed lose more magnesium — and those who lose magnesium are more stressed.
Those Taking Certain Medications
- Proton pump inhibitors (omeprazole, pantoprazole, lansoprazole): Reduce the gastric acidity necessary for magnesium absorption. Prolonged use is associated with documented hypomagnesaemia.
- Diuretics: Increase renal elimination of magnesium, especially thiazides.
- Antibiotics (aminoglycosides): Increase renal excretion.
- Immunosuppressants (ciclosporin, tacrolimus): Cause renal magnesium loss.
Those Who Consume Alcohol Regularly
Alcohol has direct effects on intestinal absorption and renal elimination of magnesium. Even moderate but regular consumption contributes to reducing levels over time.
People with Type 2 Diabetes
Hyperglycaemia increases renal magnesium loss through glycosuria. At the same time, magnesium deficiency contributes to insulin resistance, creating another vicious cycle.
Elderly People
With advancing age, intestinal magnesium absorption decreases, renal excretion increases, and dietary intake tends to decline.
How Magnesium Is Measured in the Body: Limitations of Standard Tests
Serum magnesium is the routine test, but it is a very imprecise indicator of body magnesium status. 99% of total magnesium is found intracellularly (muscles, bones, soft tissues) — only 1% is in the plasma. The body maintains plasma levels stable at the expense of tissue deposits: when serum levels fall, depletion is already advanced.
More accurate tests:
- Erythrocyte magnesium (in red blood cells): Better reflects intracellular reserves, but is not included in standard tests.
- 24-hour urinary magnesium: Useful for evaluating renal loss.
- Magnesium loading test: Intravenous administration with retention measurement — gold standard but rarely used in clinical practice.
In practice, clinical assessment is often based on a combination of symptoms, risk factors, and response to supplementation. If symptoms improve significantly within 4–6 weeks of supplementation, the deficit was real.
Foods Richest in Magnesium
Before resorting to supplements, it is important to optimise nutrition. The richest magnesium sources:
| Food | Mg per 100g | Notes |
|---|---|---|
| Pumpkin seeds (dried) | ~550 mg | The most concentrated dietary source |
| Wheat bran | ~490 mg | Reduced bioavailability due to phytates |
| Chia seeds | ~335 mg | Good omega-3/Mg ratio |
| Almonds | ~270 mg | Also a calcium and vitamin E source |
| Cashews | ~260 mg | — |
| Black beans (dried) | ~170 mg | Cooking reduces phytates |
| Spinach (cooked) | ~85 mg | Cooking improves bioavailability |
| Avocado | ~29 mg | Also a potassium and healthy fat source |
| Banana | ~27 mg | — |
| Dark chocolate ≥70% | ~170 mg | Also a source of iron and polyphenols |
The practical problem is twofold: many people do not regularly consume these foods, and cooking or refining reduces magnesium content. Even those who eat well may struggle to reach the recommended 350–400 mg/day from diet alone.
Side Effects of Magnesium: What Happens with Excess
Before discussing supplementation, it is useful to understand possible side effects — because this is the most searched secondary query on this topic, and the answer is reassuring with some important exceptions.
Magnesium has a wide safety margin. Excess is eliminated by the kidneys without accumulating in tissues, except in one specific case.
- Laxative effects: The most common complication, dose-dependent and more frequent with poorly absorbable forms (oxide, sulphate). Excess magnesium in the intestine draws water osmotically, causing soft stools or diarrhoea. With bisglycinate this effect is much less pronounced, precisely because it is efficiently absorbed.
- Nausea and abdominal pain: Always dose-dependent, reversible by reducing the dose.
- Hypotension: At very high doses (>700–800 mg/day), magnesium can lower blood pressure. Not a problem at physiological dosages.
- Hypermagnesaemia (accumulation): Occurs almost exclusively in those with severe renal failure. Healthy kidneys easily eliminate any excess magnesium.
Main contraindication: Severe renal failure (eGFR < 30 ml/min). In this case, magnesium supplementation must be assessed with a doctor.
How to Supplement Magnesium: Which Form to Choose
Not all forms of magnesium on the market have the same efficacy. The main difference concerns bioavailability — the percentage of magnesium that is actually absorbed and utilised by the body.
- Magnesium oxide: The cheapest and most widespread form. Bioavailability around 4%. Frequently causes laxative effects. Not the recommended choice for correcting a deficiency.
- Magnesium citrate: Good bioavailability (~30%), but laxative at doses above 200–300 mg. Useful for those who also have constipation problems.
- Magnesium bisglycinate: Chelated form with glycine, high bioavailability and minimal gastrointestinal effects. The reference form for those who want to supplement continuously without discomfort. Glycine itself has documented relaxing effects on the nervous system.
- Magnesium taurate: Chelated with taurine, particularly studied for cardiac function.
- Magnesium L-threonate: More easily crosses the blood-brain barrier, studied for cognitive function.
→ Read more: Magnesium Bisglycinate — what it's used for, benefits and complete contraindications
When and How to Start Supplementing
If you recognise two or more of the symptoms described above, especially in combination with risk factors such as chronic stress, a diet poor in whole grains and vegetables, or use of antacid medications, a supplementation cycle with magnesium bisglycinate for 8–12 weeks is a safe, inexpensive, and often very effective intervention.
The best time to take it is in the evening, about 30–60 minutes before bedtime: it promotes nervous system relaxation and improves sleep quality. It can be taken with or without food — with bisglycinate there are no particular timing constraints related to meals.
Improvements are typically perceived from the second to third week, with an effect plateau around the sixth to eighth week. If sleep is a parallel problem, magnesium can act on both fronts simultaneously.
ORA VITA – Magnesium Bisglycinate 450 mg + Vitamin D3 & B6
The most bioavailable form, with the synergy of D3 and B6 for the nervous system, energy, and muscle function. Italian formulation, vegetable capsules.
→ View Product
The most bioavailable form, with the synergy of D3 and B6 for the nervous system, energy, and muscle function. Italian formulation, vegetable capsules.
→ View Product
Scientific sources: Fatima G et al., Cureus 2024 (DOI:10.7759/cureus.71392); Garrison SR et al., Cochrane Database Syst Rev 2020 (DOI:10.1002/14651858.CD009402.pub3).
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