In fact, if you fall into either of these two groups, you should think twice before taking magnesium — or any supplement — without talking to your doctor first.
1. People With Kidney Problems Should Avoid Magnesium
For those with kidney issues, magnesium supplements can pose significant danger. The kidneys are responsible for filtering excess minerals from the body — and when they aren’t functioning properly, magnesium can build up to toxic levels in the bloodstream.
- Irregular heartbeat
- Confusion or disorientation
- Extremely low blood pressure
- Weak or slowed breathing
- In severe cases, even coma or death
As WebMD explains, people with impaired kidney function simply can’t clear magnesium efficiently. That means even small doses that are safe for most people can become dangerous.
Doctors urge anyone with chronic kidney disease, reduced kidney function, or past kidney injury to avoid magnesium unless it’s specifically prescribed and closely monitored by a healthcare provider.
2. People Without a Magnesium Deficiency Don’t Need It
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