Magnesium Oxide
High concentration of elemental magnesium but low bioavailability (4%). Primarily used as an osmotic laxative. Economical but not recommended for general supplementation.
What is it for?
Cofactor in ATP production
Regulates heart rhythm and blood pressure
For hot flashes, sleep, mood and bone density
Reduces cramps and menstrual pain. 300-400mg/day from mid-cycle
Prevents cramps, improves recovery
Bisglycinate form especially effective
Deficiency associated with increased stress
Very common deficiency
Reduces nocturnal cramps and risk of preeclampsia
Reduces hot flashes, improves sleep and mood. Common deficiency
Cofactor in neurotransmission
Hormonal cofactor
Protects cochlear hair cells. Deficiency associated with greater tinnitus
Improves insulin resistance and reduces anxiety
Reduces cramps and pelvic muscle pain
Citrate form aids intestinal transit
Deficiency associated with accelerated aging. Cofactor in DNA repair.
Necessary for muscle contraction
Recommended doses
Range: 200 – 600 mg
Scientific references (2)▼
Revisión sistemática 2025 sobre el magnesio en la profilaxis de la migraña. El óxido de magnesio es la forma más estudiada en este contexto, aunque su biodisponibilidad es inferior a otras formas orgánicas de magnesio.
Revisión de salud pública 2025 sobre el magnesio: el óxido de magnesio tiene solo un 4% de biodisponibilidad oral comparado con otras formas, pero su alta concentración elemental (60%) lo hace popular y asequible como suplemento de mantenimiento básico.
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