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Moumoujus

MAGNESIUM OXIDE.

Valuable CAS 1309-48-4 / ABSORBENT, BUFFERING, OPACIFYING

Magnesium Oxide is a versatile mineral compound known for its ability to absorb excess sebum, meticulously regulate skin pH, and offer calming benefits. Its multi-functional nature makes it suitable for formulations targeting oily and sensitive skin concerns, while also supporting skin barrier integrity.

Summary

Absorbent Buffering Opacifying Soothing Antioxidant Barrier Support Light Diffuser Thickener Stabilizer Anti-caking Agent

Science

Mechanism of Action

This ingredient functions by absorbing excess oil and impurities due to its porous structure, leading to a mattifying effect and reduced potential for acne formation. It acts as a mild buffering agent, precisely adjusting formulation pH to support product stability and the skin's natural barrier function. Magnesium Oxide also provides a subtle physical barrier against environmental pollutants and UV radiation, and its high refractive index allows it to diffuse light, softening the appearance of fine lines and imperfections. Furthermore, it possesses calming and soothing properties that may diminish inflammation, redness, and irritation, traps free radicals to mitigate oxidative stress, and supports skin regeneration, moisture retention, and barrier strengthening.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

2%

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Unknown
Optimal pH N/A
0 7 14

Stability

Magnesium oxide is a hygroscopic white powder, insoluble in water and ethanol. It reacts vigorously with acids, forming magnesium salts and generating heat. In formulations, it primarily serves as a mild pH adjuster and buffer, crucial for maintaining product stability and protecting skin from irritation by ensuring a balanced pH environment.

Conflicts

  • Strong acids (vigorous exothermic reaction)
  • Chlorine Trifluoride (violent reaction producing flames)
  • Phosphorous Pentachloride (incandescent reaction)
  • Excessive use may lead to skin dryness or mild irritation, particularly in individuals with dry or sensitive skin.

Safety

Safety Profile

CIR Status
Deferred evaluation
Sensitization risk Low

The Food and Drug Administration (FDA) lists Magnesium Oxide as Generally Recognized as Safe (GRAS) for direct food substances and an approved ingredient for Over-the-Counter (OTC) antacid drug products. The Cosmetic Ingredient Review (CIR) Expert Panel deferred its evaluation, acknowledging the FDA's safety assessment. It is generally recognized as safe for topical cosmetic use, with adverse reactions being relatively uncommon.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Magnesium Oxide is a valuable multi-functional ingredient, particularly effective for managing oiliness and pH balance, while offering calming, protective, and light-diffusing benefits with a low risk of irritation.

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