If you’re referring to the headline “Health experts issue a new warning about magnesium supplements—especially for these two high-risk groups,” the concern is real, but the headline is somewhat sensationalized.
⚠️ The two groups that need the most caution
1. People with kidney disease
Healthy kidneys remove excess magnesium through urine. When kidney function is significantly reduced, magnesium from supplements or magnesium-containing medicines can accumulate and, at very high levels, cause low blood pressure, breathing problems, abnormal heart rhythms, and potentially cardiac arrest.
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Office of Dietary Supplements
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2. People taking medications that interact with magnesium
Magnesium can interfere with absorption of certain antibiotics (including doxycycline, ciprofloxacin, and levofloxacin) and bisphosphonates such as alendronate. These medicines often need to be separated from magnesium by several hours.
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Office of Dietary Supplements
Other important points
Magnesium from ordinary foods isn’t generally the problem; the concern is mainly concentrated supplements and magnesium-containing medicines.
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Office of Dietary Supplements
For adults, the upper limit for magnesium from supplements and medications is 350 mg per day, unless a healthcare professional recommends otherwise.
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Office of Dietary Supplements
Some medications can actually lower magnesium, including long-term proton-pump inhibitors, while certain diuretics can either increase or decrease magnesium loss.
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Office of Dietary Supplements
Older adults aren’t automatically prohibited from taking magnesium, but kidney function can decline with age, making medication/supplement review particularly important.
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Office of Dietary Supplements
Bottom line: Don’t stop magnesium—or a prescribed medicine—just because of a social-media warning. If someone has kidney disease, is on dialysis, or takes several medications, they should check with their doctor or pharmacist before starting a magnesium supplement.
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National Kidney Foundation
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If you give me the magnesium type and dose (for example, magnesium glycinate 200 mg) and the medicines being taken, I can check the specific combination.
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