Science
Mechanism of Action
This ingredient operates via multiple pathways. As an antimicrobial, it actively inhibits the proliferation of microorganisms on the stratum corneum, imparting temporary bactericidal and fungicidal effects. It functions as a chelating agent by binding to metal cations like calcium and magnesium, thus stabilizing formulations and enhancing the bioavailability of other components. Its humectant action draws and retains moisture, preventing transepidermal water loss and maintaining skin hydration. Furthermore, it attenuates unpleasant odors, reduces product transparency as an opacifying agent, and can mechanically exfoliate the stratum corneum. It also absorbs excess substances, acts as a bulking agent to regulate water content and volume, buffers against organic acids to stabilize pH, and can protect cosmetic products from UV degradation.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The ingredient acts as a buffer, helping to stabilize product pH, particularly against organic acids. Optimal pH ranges for its metallic hydroxide components vary, with aluminum coagulants typically effective between pH 5.5 and 8.0, and iron coagulants demonstrating efficacy across a broader range of 5.0 to 11.0, indicating its robust stability in diverse pH environments.
Conflicts
- Strong acids, such as concentrated sulfuric acid, due to potential violent and explosive reactions with sodium hydroxide, a component in its formation.
- Certain organic compounds, particularly in the presence of sodium hydroxide.
Safety
Safety Profile
The complex ingredient 'SODIUM/ALUMINUM/IRON HYDROXIDE/OXALATE/SULFATE' has not been directly evaluated by CIR or SCCS. However, its constituent components have undergone safety assessments. Aluminum, while capable of inducing toxic effects at high systemic doses, is generally considered safe for cosmetic use when present as alumina or aluminum hydroxide, with the FDA approving aluminum hydroxide for various cosmetic and medical applications. Studies suggest that aluminum salts in topical applications like antiperspirants primarily form insoluble gels, limiting dermal penetration. Sodium hydroxide, a component used in its synthesis, is highly irritating in its unreacted form but is deemed harmless once fully reacted within cosmetic formulations, with strict regulatory guidelines in place. Sodium sulfate has been found safe for rinse-off products and at concentrations up to 1% in leave-on formulations by the CIR.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its diverse potential functional benefits, the absence of direct safety and efficacy review for this complex ingredient necessitates further dedicated research for a comprehensive assessment in skincare applications.
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