Science
Mechanism of Action
This ingredient operates primarily as an antioxidant by scavenging free radicals, thereby mitigating oxidative damage to skin cells and preserving the integrity of cosmetic formulations. It also acts as an effective preservative against bacteria and molds. Furthermore, Sodium Sulfite functions as a reducing agent, capable of altering molecular structures, which is leveraged in hair treatments like permanent waves.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium sulfite presents as a white, water-soluble solid. Its aqueous solutions are notably alkaline, typically around pH 9, with a 10% anhydrous solution exhibiting a pH range of 8.5-11.5. This compound is susceptible to oxidation in air, slowly converting to sulfate; the anhydrous form demonstrates superior stability compared to its heptahydrate counterpart.
Safety
Safety Profile
The CIR Expert Panel has deemed Sodium Sulfite safe for cosmetic use, with reported concentrations up to 3% in rinse-off products. While generally well-tolerated, individuals with sensitive skin or known sulfite allergies should proceed with caution due to potential skin irritation or allergic reactions. The FDA recognizes Sodium Sulfite as GRAS (Generally Recognized As Safe) for its use as a chemical preservative in food applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Sulfite is a valuable ingredient for product longevity and oxidative stress protection, offering antioxidant and preservative benefits, though caution is advised for individuals with sensitive skin or sulfite allergies.
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