Science
Mechanism of Action
Acting primarily as an effective absorbent, Magnesium Carbonate Hydroxide efficiently controls surface oil and moisture, contributing to a lasting matte finish on the skin. Within cosmetic formulations, it functions as a buffering agent, stabilizing product pH, and a viscosity regulator, adjusting the thickness of formulations. It also acts as a binder, ensuring ingredient cohesion, and a bulking agent, adding volume. On a dermal level, it exhibits mild astringent properties that can smooth and soften the skin. The magnesium component generally promotes skin barrier strength, aids cellular regeneration, calms irritation and redness, and helps replenish moisture due to its hygroscopic nature. Furthermore, it possesses anti-inflammatory and antibacterial effects, can neutralize acidic compounds, and may help regulate skin pigmentation. In rinse-off applications like masks or scrubs, it provides a gentle exfoliating action, and it can contribute to UV reflection as a physical barrier in sunscreens.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Magnesium Carbonate Hydroxide is widely utilized in powder-based cosmetic formulations such as setting powders, blushes, and foundations due to its absorbent and bulking properties, making it an ingredient commonly associated with dusting during application.
The Formula
Formulation
Stability
This ingredient is odorless and highly stable in air, exhibiting good thermal stability. It plays a crucial role as a buffer, effectively stabilizing the pH of cosmetic products. While magnesium carbonate is largely insoluble in water, it contributes a slightly alkaline reaction to formulations.
Conflicts
- strong acids
- oxidizing agents
Safety
Safety Profile
Magnesium Carbonate Hydroxide is generally considered safe for topical use. The CIR Expert Panel found a related compound, magnesium hydroxide, safe for use in certain hair products when skin contact is minimized, and safe for other cosmetic uses when formulated to be non-irritating. It is recognized as GRAS (Generally Recognized As Safe) for food applications and is listed in the FDA Inactive Ingredients Database for oral pharmaceuticals. EWG's Skin Deep database indicates low concerns regarding cancer, allergies, immunotoxicity, and developmental or reproductive toxicity. Specific maximum concentrations for all cosmetic applications are not uniformly detailed, but topical use is typically well-tolerated by most skin types.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Magnesium Carbonate Hydroxide is a valuable ingredient, particularly for oily and sensitive skin types, offering significant oil absorption and pH-stabilizing benefits with a low risk of irritation or comedogenicity.
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