It's three in the morning and a calf cramp suddenly wakes you up. Or it's mid-afternoon and you realize you've snapped at a colleague for the third time, for no real reason. Or again, you sleep your seven hours but wake up feeling like you haven't rested at all.
Episodes like these, taken individually, seem like minor inconveniences in a busy life. But when they recur and start to add up, they can tell a different story: that of a magnesium deficiency, a condition more common than imagined and often difficult to recognize, precisely because its signs blend with those of daily stress.
In the guide below, you will find the most common signs your body gives to indicate a possible magnesium deficiency, the physiological explanations behind each sign, the most frequent causes of the deficit, and concrete steps to bring mineral levels back to normal.
You will also find a clear indication of when it's time to talk to your doctor, because self-diagnosis, when it comes to minerals, is never a good idea.
Magnesium deficiency (hypomagnesemia): why it's more common than you think
In the clinical field, magnesium deficiency is called hypomagnesemia and indicates a blood magnesium concentration below reference values. The definition, however, tells only part of the story.
Indeed, there is a fundamental difference between a frank deficiency, which is rarer and linked to specific diseases or therapies, and a marginal deficiency (also called subclinical), which is more frequent, where the mineral reserves gradually decrease without blood tests showing obvious alterations.
The reason is simple to understand: only about 1% of body magnesium circulates in the blood, while the remaining portion is stored in bones, muscles, and soft tissues. The body prioritizes maintaining blood levels, drawing on internal reserves when intake is scarce.
This is why you can have reduced reserves even with a formally normal magnesium level.
The widespread nature of the problem is rooted in the contemporary lifestyle. Diets rich in refined foods and poor in vegetables, frantic rhythms, prolonged stress, intense sport, and abundant sweating increase the consumption and elimination of the mineral. In addition, the reference nutritional values of magnesium for an adult are around 375 mg (the European nutrient reference value), a threshold that many people do not reach through diet alone.
What magnesium is for: the vital functions that depend on the mineral
To understand why a magnesium deficiency produces such diverse effects, we need to look at the role the mineral plays in the body. Magnesium participates as a cofactor in over 300 enzymatic reactions, a number that alone explains how broad its action is.
Among the main functions:
● Muscle contraction and relaxation: magnesium works in balance with calcium. Calcium triggers muscle fiber contraction, magnesium promotes its release. Without adequate levels of the mineral, the muscle struggles to "let go."
● Nerve transmission: the mineral modulates neuron excitability and communication between nerve cells, impacting mood, concentration, and stress response.
●Energy metabolism: ATP, the molecule that fuels every cellular process, is only active when bound to magnesium. Low reserves practically mean less available energy.
● Electrolyte balance: together with potassium, sodium, and calcium, magnesium regulates the passage of fluids and electrical signals through cell membranes, from heart rate to muscle function.
● Protein synthesis and bone health: about 60% of body magnesium resides in the skeleton, where it contributes to maintaining normal bones. If you want to delve deeper into the mechanisms that regulate vitality and fatigue, you will find a dedicated overview in the Energy and Vitality section.
Signs of magnesium deficiency not to ignore
Let's now look, one by one, at the signs a magnesium deficiency can manifest.
Many have alternative causes, and only a doctor can evaluate the complete picture. Their combination and persistence, however, deserve attention.
1. Muscle cramps and nocturnal contractures
Magnesium contributes to normal muscle function, and it is to this function that the most common muscle disorders, such as cramps, are linked. The mineral works in balance with calcium: calcium initiates fiber contraction, magnesium promotes its release. When the mineral intake is reduced, the muscle may struggle to "let go," resulting in involuntary contractions that primarily affect the calves and feet, often at night.
If waking up with "stone-hard" calves has become a habit, we recommend reading our in-depth article on nocturnal muscle cramps, where we analyze causes and remedies in detail.
2. Chronic fatigue and unjustified exhaustion
Magnesium contributes to normal energy metabolism and the reduction of tiredness and fatigue. At the cellular level, ATP (the "energy currency" of cells) is active precisely in conjunction with magnesium: when the mineral intake is insufficient, it is understandable to feel a fatigue that rest struggles to alleviate.
Fatigue that persists for weeks can have many possible causes and always warrants a discussion with your doctor; meanwhile, you can read our article on chronic fatigue and the guide to factors influencing energy levels.
3. Irritability, nervousness, and mood swings
Magnesium contributes to normal psychological function and the normal functioning of the nervous system. An adequate intake of the mineral therefore supports the balance of nervous processes, while during intense periods many people report feeling more tense and reactive.
It is worth remembering a well-documented cycle in research: prolonged stress increases the urinary excretion of magnesium, and this is also why maintaining adequate mineral intake during demanding periods makes sense.
4. Sleep and quality of nighttime rest
The relationship between magnesium and nighttime rest is an area that scientific research has explored with interest: some evidence in the literature has investigated the link between mineral levels and sleep quality. These are scientific observations, not an indication for use: magnesium should not be expected to have a "sleep-inducing" effect, and supplementation does not replace proper sleep hygiene or specialist evaluations in case of persistent difficulties.
To learn more, we have dedicated an article to the relationship between magnesium and sleep.
5. Muscle weakness and fatigue during exertion
Muscle weakness is also linked to normal muscle function and normal energy metabolism, to which magnesium contributes. It is a different sensation from a cramp: muscles seem "unresponsive," legs feel heavy, and your usual workout seems more strenuous.
Athletes, who lose significant amounts of the mineral through sweating, know this well: it is no coincidence that this topic is central to our research on magnesium and pomegranate polyphenols in athletes and the in-depth articles in the Sports Performance section.
6. Eyelid twitching and small spasms
Eyelid twitching that appears during stressful periods is a common phenomenon, often associated with fatigue, lack of sleep, and caffeine. Some scientific evidence has explored the link between magnesium levels and neuromuscular excitability.
Normally, these small spasms are transient; if they persist for a long time or spread to other areas, it is advisable to discuss it with your doctor.
7. Tingling and numbness (paresthesia)
Tingling, a "pins and needles" sensation, or numbness in the hands, feet, or around the mouth are sensations that can have many origins. Scientific literature has investigated the role of magnesium in the transmission of impulses along peripheral nerves.
When these sensations are recurrent or pronounced, it is important to consider them a signal not to be overlooked and to consult with your doctor, who can evaluate the most appropriate tests.
8. Loss of appetite, nausea, and concomitant potassium deficiency
In stages where mineral intake is reduced, the literature has described the appearance of non-specific symptoms such as loss of appetite and nausea. There is also a less known and studied aspect: magnesium and potassium are closely linked, because magnesium is essential for the functioning of the "pump" that retains potassium inside cells.
This is why, in the event of a confirmed deficiency, doctors usually assess both minerals.
Causes of Magnesium Deficiency: Stress, Sweating, and Diet
Recognizing the warning signs is the first step; understanding the root cause of the problem is the second. The most frequent causes of insufficient intake or excessive elimination of magnesium are:
● Unbalanced diet: a diet poor in green leafy vegetables, legumes, nuts, and whole grains, and rich in refined products, struggles to meet daily requirements. The refining of cereals, for example, eliminates much of the magnesium contained in the grain.
● Intense sweating: sports, physical labor, and hot months increase mineral loss through sweat. Those who train regularly have higher-than-average needs.
● Prolonged stress: stress hormones increase the urinary elimination of the mineral, fueling the vicious cycle described above.
● Age: with advancing age, the intestinal absorption of magnesium decreases and renal elimination increases, which is why elderly people are at risk.
● Gastrointestinal disorders: conditions that reduce nutrient absorption (malabsorption syndromes, chronic diarrhea, inflammatory bowel diseases) directly affect mineral reserves.
● Certain medications: diuretics, proton pump inhibitors, and other active ingredients, if taken long-term, can reduce magnesium levels. For this reason too, the golden rule applies: for chronic therapies, any assessment must be shared with your doctor.
● High alcohol consumption: alcohol increases the urinary elimination of the mineral and is often accompanied by a deficient diet.
Magnesium Deficiency in Women: Why Needs Change at Certain Life Stages
Women deserve a separate chapter, because their magnesium balance goes through physiological phases that modify their needs and their perception of warning signs.
In the days leading up to the menstrual cycle, hormonal fluctuations are associated with a reduction in mineral levels, and many women report more irritability, muscle tension, headaches, and cravings for sweets during that period.
During pregnancy and breastfeeding, needs naturally increase, because the mineral also supports the baby's growth (however, any supplementation during pregnancy must always be agreed with your gynecologist).
Finally, with menopause, the drop in estrogen affects the absorption and utilization of magnesium, at a stage where the mineral is also valuable for maintaining normal bones.
If you recognize yourself in one of the phases just described and the symptoms sound familiar, you can find more detailed information in our article on magnesium and female well-being, as well as the content of the Well-being Guide.
What to do in case of magnesium deficiency: steps to restore levels
Do you suspect a deficiency? The correct path starts with medical confirmation (the doctor can prescribe tests and interpret them in light of your symptoms) and continues with a gradual approach, where diet, lifestyle, and eventual supplementation work together.
Here are the three steps to follow.
Step 1: Start with food, choosing foods rich in magnesium
The primary source of magnesium remains food. The richest choices of the mineral are:
● Green leafy vegetables (spinach, chard, turnip greens): chlorophyll contains magnesium at the center of its structure;
● Nuts and seeds (almonds, cashews, pumpkin seeds, and sunflower seeds): a handful a day is a valuable habit;
● Legumes (beans, chickpeas, lentils) and whole grains (oats, brown rice, buckwheat);
● Dark chocolate (at least 70% cocoa), the most welcome news on the list;
● Bananas, avocados, and magnesium-rich mineral waters.
A practical tip: magnesium is water-soluble and partially dispersed with prolonged boiling. Prefer steaming or short cooking times, and when possible, reuse the vegetable cooking water for soups and risottos.
A well-constructed Mediterranean diet, with plenty of vegetables, legumes, and whole grains, remains the best starting point.
Step 2: Take care of hydration and lifestyle
The second front concerns habits. If you exercise or sweat a lot, consistently rehydrate before, during, and after activity: with sweat, you lose not only water but also electrolytes. Then, work on factors that accelerate mineral consumption: take real breaks on busy days, prioritize regular sleep, and moderate caffeine and alcohol. These are simple actions that reduce magnesium loss and, at the same time, alleviate some of the described symptoms.
In our article focused on tips to boost energy levels, you'll find other practical strategies to integrate into your routine.
Step 3: Consider magnesium supplementation when diet is not enough
There are situations where diet alone struggles to meet requirements: periods of intense stress, frequent workouts, abundant sweating, and life stages with increased needs. In such circumstances, a magnesium supplement can support the daily intake of the mineral, always as a complement (and never as a substitute) to a varied and balanced diet and a healthy lifestyle.
Before starting, consult your doctor or pharmacist, especially if you are taking medication or have kidney conditions: they will advise you if supplementation is right for you.
How to choose a magnesium supplement: the role of bioavailability
Standing in front of the shelf, the question naturally arises: why are there so many types of magnesium?
The answer lies in the chemical form in which the mineral is delivered. Magnesium, in fact, is never found "alone": it is always bound to another molecule, and the type of bond determines its bioavailability, i.e., the amount that the body can actually absorb and utilize.
Inorganic forms (such as magnesium oxide) contain a lot of mineral by weight, but are absorbed less efficiently.
Organic forms (such as citrate, bisglycinate, or pidolate) contain proportionately less, but the bond with organic molecules facilitates their passage through the intestinal wall.
There is no single "right" form: there is the form best suited to your needs, and here too, the advice of a pharmacist is invaluable.
Magnesium citrate: a highly bioavailable source
Among the organic forms, magnesium citrate is one of the most studied. It is the mineral bound to citric acid (in a 1:1 ratio), the same molecule found in citrus fruits and involved in the energy processes of cells. The organic bond promotes the solubility of the compound and, consequently, the intestinal absorption of the mineral. Studies on magnesium citrate have observed an increase in magnesium levels in muscles and the brain, with a dose-proportional trend.
Improve Magnesio: Esserre's formula with magnesium citrate
Improve Magnesio is an Esserre food supplement developed from magnesium citrate, designed for those who want to support their daily mineral intake with a carefully crafted formula. Improve Magnesio combines magnesium citrate with Mediterranean pomegranate extract PunicaPLUS® and Vitamin C, in convenient gluten-free and lactose-free sachets.
The product is part of the Improve line, dedicated to supporting energy, vitality, and daily well-being.
The properties of Improve Magnesio
The properties of the formulation are based on EFSA-approved claims for its ingredients, and directly address the signals described throughout the guide:
● magnesium contributes to normal muscle function
● magnesium contributes to the reduction of tiredness and fatigue
● magnesium contributes to normal psychological function and the normal functioning of the nervous system
● magnesium contributes to electrolyte balance and normal protein synthesis;
● Vitamin C contributes to the protection of cells from oxidative stress and, also, to the reduction of tiredness and fatigue.
Magnesium Citrate, PunicaPLUS® and Vitamin C: what the formulation provides
At the base of the formula is magnesium citrate, the highly bioavailable organic source we discussed: its bond with citric acid favors its solubility and absorption, so that the mineral is well utilized by the body.
Alongside the citrate works PunicaPLUS®, the exclusive Mediterranean pomegranate dry extract obtained from the whole fruit and rich in bioactive compounds, including polyphenols, punicalagins and ellagic acid, with an antioxidant action documented by scientific literature (if this topic interests you, we have dedicated a publication to the properties of pomegranate anthocyanins and ellagitannins and one to pomegranate polyphenols and water-soluble vitamins in reducing fatigue).
The formula is completed by Vitamin C, which contributes to the protection of cells from oxidative stress and promotes normal collagen formation for the normal function of skin, bones, cartilage, blood vessels, gums and teeth, as well as contributing to the normal functioning of the immune system.
How to use Improve Magnesio
For dosage and timing, follow the instructions on the label and do not exceed the recommended daily dose.
Remember that food supplements should not be understood as substitutes for a varied and balanced diet and a healthy lifestyle, nor for pharmacological therapy: if you are taking medication, are pregnant or have doubts about your situation, first discuss it with your doctor or trusted pharmacist.
Frequently Asked Questions (FAQ)
To conclude, we have collected the questions we are most often asked about magnesium and its integration, with short and direct answers.
When is it best to take magnesium, in the morning or in the evening?
There is no "right" time that applies to everyone. Many people prefer the evening, while others find it more convenient in the morning or after physical activity. The aspect that truly matters is regularity of intake and adherence to the instructions on the label of the product you have chosen.
How much magnesium should I take per day?
The European reference nutrient value (NRV) for an adult is 375 mg of magnesium per day, to be obtained through diet. If you use a supplement, adhere to the daily dose indicated on the label, without exceeding it: when it comes to minerals, "more" does not mean "better".
How long can a magnesium supplement be taken?
The duration of supplementation depends on the individual situation: needs, diet, lifestyle and season all influence the overall picture. For tailored advice, consult your doctor or pharmacist, who will be able to assess your specific case and recommend the most suitable course of action.
Is magnesium deficiency linked to potassium deficiency?
Yes, the two deficiencies often go hand in hand. Magnesium is essential for the cellular mechanisms that retain potassium: when the former is scarce, the latter also tends to decrease, and the warning signs of both conditions (cramps, weakness, fatigue) overlap.
In case of confirmed deficiency, the doctor usually evaluates both minerals.
