Magnesium Oxide

Magnesium Oxide

AKA “Magnesia, Granmag, Heavy magnesium oxide, Calcined magnesia, Seawater magnesia, Anscor P, Animag, Magcal, Marmag, Oxymag”

Synthetic

Ingredient Facts

Magnesium oxide

AKA: Magnesia, Granmag, Heavy magnesium oxide, Calcined magnesia, Seawater magnesia, Anscor P, Animag, Magcal, Marmag, Oxymag

Synthetic · Opacifying · EWG: 1

Synthetic

Clean

Magnesium Oxide is the oxide salt of magnesium with antacid, laxative and vascular smooth muscle relaxant activities. Magnesium combines with water to form magnesium hydroxide which reacts chemically to neutralize or buffer existing quantities of stomach acid; stomach-content and intra-esophageal pH rise, resulting in a decrease in pepsin activity. This agent's laxative effect is the result, in part, of osmotically mediated water retention, which subsequently stimulates peristalsis. In addition, magnesium ions may behave as calcium antagonists in vascular smooth muscle.

Solubility 0.009 % at 86 °F (NIOSH, 2024)

Formula

MgO

Mol. Weight

40.30

CAS #

1309-48-4

Form

Powder

State

Magnesium oxide appears as a white solid, often found as a powder. When fine particles of magnesium oxide are dispersed in air, whether directly or when generated by the burning or cutting of magnesiu

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Functions

Opacifying

Absorbs Excess Oil

Stabilizes pH

Adds Opacity

Maintains optimal pH

Creates creamy opacity

Traditional Use

Magnesium oxide has been used in traditional cosmetics and medicine for centuries as a mild abrasive and drying agent. Historically incorporated into face powders and mineral-based skincare products for oil absorption.