Science
Mechanism of Action
Magnesium Carbonate functions predominantly as a potent absorbent, effectively drawing excess oil and sebum from the skin's surface, resulting in a fresh, clean, and matte complexion with reduced pore visibility. It exhibits hygroscopic properties, allowing it to attract and lock in moisture, thereby assisting in preventing moisture loss and maintaining skin suppleness, especially when integrated into hydrating formulations. The ingredient further provides soothing and anti-inflammatory benefits. Its weak alkalinity, with a typical pH between 8 and 9, helps neutralize acidic sweat metabolites, consequently inhibiting bacterial growth and managing body odor. In certain applications, such as masks and scrubs, it offers a gentle exfoliating action. Additionally, it acts as a bulking agent, filler, anti-caking agent, and texture enhancer, improving product consistency and sensorial experience. It may also influence skin pigmentation by modifying the skin's microenvironment and potentially reducing melanin production.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 A clinical study demonstrated that a loose powder containing 5% magnesium carbonate effectively reduced surface skin oil by 30% within two hours of application.
- 02 Mesoporous magnesium carbonate (Upsalite®) was dermatologically tested on 50 human volunteers, proving to be non-irritant, non-sensitizing, and hypoallergenic, delivering instant and long-lasting mattifying effects without causing skin dryness or irritation.
- 03 In vitro studies indicated that magnesium carbonate is nontoxic to human dermal fibroblasts at a concentration of 1 mg/mL, with topical application showing negligible cutaneous reactions.
Transparency
Dusting Analysis
As a fine powder, Magnesium Carbonate is frequently utilized in cosmetic formulations like loose powders, foundations, and dry shampoos, where its particulate nature is crucial for its absorbent and texturizing functions. Its role as an anti-caking agent further underscores its primary use in powdered forms.
The Formula
Formulation
Stability
Magnesium Carbonate is a basic alkaline earth salt known for its excellent chemical stability. Its inherent weak alkalinity (pH ≈ 8-9) can be leveraged for pH adjustment within formulations. It effectively serves as an anti-caking, filler, and thickening agent. The ingredient also plays a role in stabilizing peroxide in hair bleaching products, helps dilute color, and enhances adhesiveness in powder cosmetics. In anhydrous formulations, it can mitigate syneresis and support high oil loading.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Magnesium Carbonate is safe for cosmetic use at current practices and concentrations, provided formulations are non-irritating. Its safety assessment by CIR was deferred, as the FDA affirms it as Generally Recognized As Safe (GRAS) for direct food substances and approves its use in OTC antacid drug products. It is broadly considered safe, non-irritating, and suitable for sensitive skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Magnesium Carbonate is a valuable ingredient, particularly beneficial for oily and sensitive skin types, owing to its proven efficacy in oil absorption, mattifying effects, and overall skin compatibility, while also providing significant formulation benefits.
Related
Similar Ingredients
Finding similar ingredients…
References
Sources