If you’re referring to the recent warnings about magnesium supplements, the important point is that magnesium is not automatically safe just because it is a mineral.
The two groups that generally deserve particular caution are:
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People with kidney disease or reduced kidney function. The kidneys normally remove excess magnesium. When kidney function is impaired, magnesium can accumulate and, in severe cases, cause weakness, low blood pressure, abnormal heart rhythms, or other serious problems. Supplements should therefore be discussed with a clinician.
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People taking certain medications. Magnesium can interfere with the absorption of some medicines, including certain antibiotics and thyroid medication. Depending on the drug, taking magnesium several hours apart may be necessary.
For most healthy adults, magnesium from food is generally preferable. High doses from supplements can cause diarrhea, nausea and abdominal cramping, and very large amounts can be dangerous.
If you tell me where you saw this warning (or paste the full article/headline), I can explain exactly which two risk groups the warning refers to and whether the claim is supported by current medical guidance.
