Could you share the warning or article you’re referring to?
The phrase “Anyone taking magnesium is issued a warning if they fall under any of these two groups” doesn’t identify which two groups are meant.
In general, magnesium supplements are often used cautiously in people who:
- Have significant kidney disease, because the kidneys may not clear excess magnesium effectively.
- Take certain medications that can interact with magnesium (for example, some antibiotics, osteoporosis medications, or thyroid medications).
But different warnings may refer to entirely different groups. If you paste the text, headline, or a screenshot of the warning, I can explain exactly what it means.
