Science
Mechanism of Action
Operating as an effective astringent, Sodium Alum induces the contraction of skin tissues, leading to a temporary reduction in pore visibility and a firmer skin appearance. As an antiperspirant, it aids in reducing perspiration by constricting sweat ducts. Furthermore, it exhibits antiseptic and bacteriostatic capabilities, actively inhibiting bacterial proliferation, which is beneficial in controlling body odor and potentially addressing acne concerns. Research on related aluminum salts also suggests potential anti-inflammatory effects through modulating myeloid cell activity in dermal models.
Research
Clinical Evidence
Medium confidence0.75%
Key findings
- 01 An in vitro study demonstrated that a 0.75% w/v concentration of a related alum compound (Potassium Aluminium Sulphate) achieved complete inhibition of axillary malodor-producing bacteria, indicating Sodium Alum's potential antimicrobial effectiveness.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Alum forms acidic solutions in water and can lead to aluminum hydroxide precipitation in alkaline conditions. It remains stable under typical use and storage conditions, though prolonged heat should be avoided. Evaporation of solutions is best performed at temperatures not exceeding 60 °C.
Conflicts
- metals in the presence of water
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not conducted a specific safety assessment for Sodium Alum (Sodium Aluminum Sulfate). However, the Scientific Committee on Consumer Safety (SCCS) determined in February 2023 that aluminum compounds are safe at specific elemental aluminum concentrations for cosmetic use: up to 6.25% in non-spray deodorants/antiperspirants, 10.60% in spray deodorants/antiperspirants, 2.65% in toothpaste, and 0.77% in lipstick. The SCCS found no reliable indication of a causal link between aluminum exposure from dermally applied cosmetic products and breast cancer or neurodegenerative diseases, noting extremely low percutaneous penetration (approximately 0.00052% on healthy skin). The FDA has designated Sodium Alum (E521) as safe for general or specific, limited use in food.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Alum is a valuable ingredient for formulations targeting oiliness, perspiration, and body odor, offering astringent and antimicrobial benefits, though its specific safety assessment by CIR is pending and potential irritancy is moderate.
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