Magnesium Supplement Guidance Stresses Caution on Dose and Diarrhea Risk

Overview

• Nutrition authorities set daily needs at about 350 mg for men and 300 mg for women, yet many over‑the‑counter tablets start at 300 mg each.
• Regulatory advice appears in two versions, with one outlet reporting a 250 mg daily cap for supplements and another quoting a BfR expert at 200 mg taken in split doses.
• Diarrhea is the most common sign of taking too much magnesium, which typically shows up before more serious problems develop.
• Extremely high intakes near 2,500 mg a day can cause paralysis, and people with impaired kidneys can reach dangerous blood levels at far lower doses.
• For confirmed deficiency and for high blood pressure care, experts report supervised daily doses around 300–600 mg, with clinicians adjusting based on blood tests.