Magnesium is an essential mineral important for muscle and nerve function, heart rhythm, and bone health. For women, magnesium supplements can be useful in cases of confirmed deficiency, such as during menstrual cramps or pregnancy. However, risks and limits are clear: dietary intake is usually sufficient; supplementation without deficiency offers no proven benefit. High doses (above 350 mg elemental magnesium per day from supplements) can cause diarrhea, nausea, and abdominal cramps. In kidney insufficiency, there is a risk of hypermagnesemia with severe side effects like low blood pressure and cardiac arrhythmias. Interactions with medications (e.g., diuretics, proton pump inhibitors) are possible. Direct-to-consumer tests (blood, urine, genetic) are often misleading because serum magnesium does not reflect total body stores. Evidence for routine use to enhance performance or prevent chronic diseases is weak. Bottom line: take magnesium only if a deficiency is confirmed by a doctor or for specific indications; more is not better.
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