Magnesium Safety & Side Effects
Our assessment
Based on the data provided, magnesium from food sources is not harmful because healthy kidneys remove excess amounts. However, magnesium from dietary supplements and medications should not be consumed above the established upper limit unless a healthcare provider recommends it. The daily upper limits vary by age group, and for many age groups, the upper limit appears to be lower than typical supplement doses NIH ODS ↗.
Safety profile
Data not available. No specific FDA adverse event reports with report counts were provided for magnesium in the DATA section. The safety concern is specifically related to consuming magnesium from supplements and medications above the upper limit, which can lead to adverse effects FDA FAERS ↗.
How it works
Magnesium supplements can interact with certain medications. For example, bisphosphonates used to treat osteoporosis are not well absorbed when taken too soon before or after taking dietary supplements or medications with high amounts of magnesium. Additionally, antibiotics might not be absorbed properly when taken with magnesium supplements NIH DSLD ↗.
Our recommendation
Do not exceed the daily upper limit for magnesium from supplements and medications unless directed by a healthcare provider. If you take bisphosphonates or antibiotics, separate your magnesium supplement from these medications by several hours to avoid absorption issues. Consult your doctor before starting magnesium supplements, especially if you have kidney problems NIH ODS ↗ NIH DSLD ↗.
AI-assisted analysis. Data sourced from NIH ODS and FDA.
Safety Overview
Magnesium that is naturally present in food and beverages is not harmful and does not need to be limited. In healthy people, the kidneys can get rid of any excess in the urine. However, magnesium in dietary supplements and medications should not be consumed in amounts above the upper limit , unless recommended by a health care provider. The daily upper limits for magnesium from dietary supplements and/or medications are listed below. For many age groups, the upper limit appears to be lower than the recommended amount . This occurs because the recommended amounts include magnesium from all sources—food, beverages, dietary supplements, and medications. The upper limits include magnesium from only dietary supplements and medications; they do not include magnesium found naturally in food and beverages. High intakes of magnesium from dietary supplements and medications can cause diarrhea , nausea, and abdominal cramping. Extremely high intakes of magnesium can lead to irregular heartbeat and cardiac arrest .
Drug Interactions
Yes. Magnesium supplements can interact or interfere with some medicines. Here are several examples: Bisphosphonates, used to treat osteoporosis, are not well absorbed when taken too soon before or after taking dietary supplements or medications with high amounts of magnesium. Antibiotics might not be absorbed if taken too soon before or after taking a dietary supplement that contains magnesium. Diuretics can either increase or decrease the loss of magnesium through urine, depending on the type of diuretic. Prescription drugs used to ease symptoms of acid reflux or treat peptic ulcers can cause low blood levels of magnesium when taken over a long period of time. Very high doses of zinc supplements can interfere with the body’s ability to absorb and regulate magnesium. Tell your doctor, pharmacist , and other health care providers about any dietary supplements and prescription or over-the-counter medicines you take. They can tell you if the dietary supplements might interact with your medicines or if the medicines might interfere with how your body absorbs, uses, or breaks down nutrients.