Science
Mechanism of Action
Magnesium Carbonate operates multifactorially within skincare formulations. Its primary action involves significant absorption of both sebum and moisture, which effectively reduces shine and contributes to a matte skin finish. Beyond absorption, it functions as a vital binder, helping to maintain product integrity and consistency, and as a bulking agent to optimize formulation volume. As a white pigment (colorant), it can enhance product aesthetics and opacity. Furthermore, it acts as a pH adjuster and buffering agent, crucial for maintaining optimal product stability and skin compatibility, and serves as an anti-caking agent to prevent powder agglomeration. Certain forms may possess hygroscopic properties that support skin moisture retention, and it potentially offers mild anti-inflammatory, soothing, and pigment-regulating benefits. In specific formulations like masks and scrubs, it can provide a gentle exfoliating action, complemented by mild astringent properties.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 In a Human Repeated Insult Patch Test involving 50 volunteers with normal to sensitive skin, mesoporous magnesium carbonate (Upsalite®) was definitively classified as 'not irritant/not required classification' and concluded to be 'non-sensitizing' or 'hypoallergenic'. The study further demonstrated its capacity to deliver instant and sustained mattifying effects on human skin without causing dryness or irritation, exhibiting no measurable flashback effect. It consistently showed superior dual-absorption capabilities for both moisture and oil, maintaining its capacity even when pre-loaded with either substance.
Transparency
Dusting Analysis
As a white cosmetic colorant and bulking agent, CI 77713 contributes to the visual opacity and overall texture of a formulation. While it is a finely milled powder, the concept of 'dusting' typically refers to undesirable visible residue from an active ingredient at high concentrations. Given its primary roles in absorption and mattifying, its inclusion is designed for aesthetic integration and performance, rather than leaving a noticeable 'dusting' effect when properly formulated.
The Formula
Formulation
Stability
Magnesium Carbonate exhibits excellent intrinsic stability and is largely inert, showing no adverse reactions with other formulation components or skin constituents. Its slightly alkaline nature allows it to function effectively as a pH adjuster and buffering agent, helping to achieve and maintain optimal product pH, particularly in the presence of acidic ingredients. The mesoporous form (Upsalite®) is particularly notable for its extraordinary capacity to simultaneously absorb both water and oil, making it valuable in anhydrous systems for superior oil control, mitigating syneresis, and facilitating high oil loading.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has assessed Magnesium Carbonate, concluding its safety in current cosmetic applications when formulated to be non-irritating. Its safety is further supported by the FDA, which lists it as Generally Recognized as Safe (GRAS) for direct food substances and approves it as an active ingredient in Over-the-Counter (OTC) antacid drug products. It is also permissible for use in cosmetics within the European Union. This ingredient demonstrates a high safety factor and is generally considered non-acne-causing.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 77713 is a valuable ingredient, particularly beneficial for oily and sensitive skin types, due to its significant mattifying and oil-absorbing capabilities, excellent safety profile, and low risk of irritation or comedogenicity.
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