Clinical nutrition specialist M Carmen Japaz has warned that magnesium functions as a metabolic key rather than an isolated fix for general health issues.
Writing in an analysis for Spanish news outlet La Razón, the specialist in clinical nutrition and nutrigenetics explained that the essential mineral requires thorough clinical evaluation because its balance in the human body depends on intestinal absorption, kidney function, medication use, and underlying medical conditions.
Japaz stated that magnesium is an essential mineral that the human body cannot produce on its own, making dietary acquisition necessary. It participates in numerous biochemical reactions, including energy production, muscle and nerve function, bone health, electrolyte balance, glucose metabolism, cardiovascular regulation, and immune system support.
Beyond its biochemical roles, Japaz emphasized that magnesium acts as a metabolic key enabling various bodily processes to work correctly across the entire system. For women going through perimenopause, a phase marked by hormonal changes, progressive loss of bone mass, and heightened cardiometabolic risk, maintaining an adequate magnesium intake forms a crucial component of a broader nutritional strategy.
However, the clinical nutritionist cautioned against viewing magnesium as a universal cure for symptoms such as fatigue, stress, muscle discomfort, or sleep disturbances. She noted that patients frequently seek supplements for these issues when the underlying causes often involve broader nutritional deficits, hormonal imbalances, digestive disorders, or undiagnosed diseases.
Essential metabolic functions
Japaz explained that magnesium does not act in isolation and must always be interpreted within the global health context of each patient. She stressed that addressing symptoms effectively requires identifying root metabolic or clinical factors rather than relying on single nutrients.
Recommended daily magnesium intake
Addressing daily requirements, Japaz explained that recommended intakes vary depending on age, sex, biological stage, and individual clinical context. As a general population guideline, recommended daily amounts range from 300 to 320 milligrams for adult women and between 350 and 420 milligrams for adult men.
She stressed that these figures serve only as general reference values. In clinical practice, actual needs fluctuate based on physical activity levels, body composition, hormonal status, existing health conditions, and ongoing medical treatments. Ideally, total daily requirements should be satisfied through diet, with any supplementation tailored specifically to an individual patient's current health status.
Side effects and laxative risks
While magnesium is generally safe, Japaz warned that oral supplements can trigger adverse effects, particularly within the digestive system. Common side effects include diarrhea, abdominal discomfort, nausea, gas, abdominal bloating, and laxative effects, especially when taken in high doses or using specific magnesium salts.
The specialist, who focuses on digestive diseases, warned specifically against using magnesium as a routine remedy for constipation. She explained that prolonged use of magnesium salts that induce diarrhea can mask underlying health problems, disrupt the intestinal microbiota, and disturb hydroelectrolytic balance, making it an inappropriate method for regulating bowel movements.
Medication interactions and contraindications
Japaz outlined critical drug interactions, noting that magnesium supplements can impair the absorption of several common medications if taken simultaneously. These include antibiotics such as tetracyclines and quinolones, bisphosphonates prescribed for osteoporosis, and levothyroxine used to treat hypothyroidism.
Furthermore, certain prescription drugs can alter the body's internal magnesium balance. These include potassium-sparing diuretics used for blood pressure management and proton pump inhibitors prescribed for gastroesophageal reflux. Because of these interactions, Japaz advised patients to review all routine medications with a healthcare professional before starting supplementation.
She added that magnesium supplementation is explicitly contraindicated or requires strict medical supervision in patients with myasthenia gravis, moderate to severe kidney failure, or specific cardiovascular diseases.
Dietary sources versus supplements
On the question of dietary deficiency, Japaz clarified that healthy individuals consuming a varied and balanced diet do not necessarily require supplements to meet their magnesium needs. However, clinical practice frequently reveals a gap between perceived eating habits and actual nutritional intake.
Many patients believe they follow a healthy diet but actually consume insufficient amounts of key magnesium sources, including legumes, nuts, seeds, green leafy vegetables, and whole grains. Japaz observed that modern society often favors purchasing a supplement over re-evaluating long-standing eating habits, even though no pill can replace a diet tailored to personal needs.
She noted that genuine magnesium deficiencies rarely stem solely from a lack of supplements. Instead, they are more commonly caused by an unbalanced diet or underlying digestive, autoimmune, or renal conditions that interfere with absorption, metabolism, or excretion. For example, women in menopause often adopt restrictive weight-loss diets that unintentionally eliminate magnesium-rich foods, compromising bone, muscle, and metabolic health.
Clinical evaluation and magnesium types
Japaz stated that supplementation should be considered only when a deficiency is formally demonstrated or when specific risk factors exist. Indications for evaluating magnesium status include conditions such as inflammatory bowel disease, celiac disease, chronic diarrhea, malabsorption, kidney disease, poorly controlled diabetes, chronic stress, or long-term pharmacological therapies.
The primary question before prescribing a supplement should focus on why a patient needs magnesium, assessing whether digestive absorption is impaired, renal elimination is altered, or individual requirements are elevated. Japaz advised consulting a physician or a specialized clinical nutritionist, particularly for individuals with chronic illnesses, kidney or digestive diseases, pregnant or breastfeeding women, or those taking regular medication.
Finally, Japaz explained that different magnesium salts offer distinct absorption rates, digestive tolerance, and clinical uses. Magnesium citrate provides good bioavailability with a mild laxative effect, magnesium bisglycinate is well tolerated digestively, and magnesium oxide delivers high elemental magnesium despite lower absorption rates. Other forms, including malate, taurate, and threonate, serve specific clinical purposes based on individual patient needs.
