Also known as: MgO, Milk of magnesia
High elemental magnesium content but poor absorption (4%). Primarily useful as a laxative; not ideal for Mg repletion.
Better forms available
Primarily as laxative
We haven’t curated landmark studies for Magnesium Oxideyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Well-established laxative effect
Consult healthcare provider
Avoid kidney disease
In-depth guides covering Magnesium Oxide — protocols, comparisons, and use cases.
Other ingredients in the Mineral category.
Formulate Research Team. (2026, August). Magnesium Oxide — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/magnesium-oxide
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.