Daily magnesium is not automatically beneficial—dose and source matter. Magnesium from foods is generally safe because the body regulates absorption. With supplements, excess intake most often causes gastrointestinal effects such as diarrhea and cramping. People with reduced kidney function should be especially cautious, since magnesium is cleared by the kidneys. Supplements can also interact with certain medications; for example, some antibiotics or thyroid medicines may need to be separated in time from magnesium. A practical approach is to prioritize dietary sources first. If a supplement is needed, start with a modest dose, monitor tolerance, and stop if side effects occur. For long-term daily use, it’s best to align the plan with a healthcare professional.