Reviewed and updated September 12, 2026 · Alurevia Editorial Team
Magnesium is an essential nutrient, but supplemental magnesium can cause side effects and is not appropriate in every circumstance. The most common issues at higher supplemental intakes are gastrointestinal.
Common magnesium supplement side effects
The NIH Office of Dietary Supplements notes that high doses of magnesium from dietary supplements or medications can cause diarrhea, nausea and abdominal cramping. Some magnesium salts are more likely to have a laxative effect than others.
What is the adult supplemental upper limit?
The Food and Nutrition Board sets a tolerable upper intake level of 350mg per day from magnesium supplements and medications for adults. The limit does not include magnesium naturally present in food.
Who should be especially cautious?
Professional advice is particularly important for people with impaired kidney function, because the kidneys play a central role in magnesium balance. Anyone taking prescription medicines should also check for interactions before adding a magnesium supplement.
Can magnesium interact with medicines?
Yes. Magnesium can interact with or affect the absorption of some medicines, including certain antibiotics and bisphosphonates. Timing and individual medication advice should come from a pharmacist or healthcare professional rather than a generic product page.
What about very high magnesium intakes?
Very large amounts of magnesium from supplements or medications can cause serious toxicity. This is one reason not to increase a dose beyond the product directions and not to stack multiple magnesium products without professional guidance.
Safety information for Alurevia Magnesium Complex
Alurevia Magnesium Complex provides 500mg elemental magnesium per capsule, which is above the adult supplemental upper limit of 350mg/day. The product page discloses this directly.
Speak with a healthcare professional before use, particularly if you have kidney disease, take prescription medicines, are pregnant or nursing, or use another supplement containing magnesium. Do not exceed the product directions.
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500mg elemental magnesium · eight named forms · one capsule per day · 90 capsules.
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Frequently asked questions
Can magnesium cause diarrhea?
Yes. Diarrhea is one of the recognised adverse effects of higher supplemental magnesium intakes.
Can I take magnesium with prescription medicine?
Some medicines can interact with magnesium or have their absorption affected by it. Ask a pharmacist or healthcare professional about your specific medicines.
Is magnesium from food included in the 350mg upper limit?
No. The adult 350mg upper limit applies to supplemental and medication sources, not magnesium naturally present in food.
Source
National Institutes of Health, Office of Dietary Supplements: Magnesium Fact Sheet for Health Professionals.
This article is general educational information and is not medical advice. Seek professional guidance for individual medical or medication questions.