pH Adjuster
FERRIC SULFATE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
An iron salt used mainly as a professional astringent — acidic and irritating. Rarely seen in conventional skincare; more of a dental / industrial material.
Ferric sulfate (CAS 10028-22-5) is an inorganic iron(III) salt that produces a strongly acidic, astringent solution. Its main practical uses are in dental hemostasis (e.g., Astringedent) and in water treatment as a coagulant. ECHA classifies the anhydrous/solution forms as irritant or corrosive (Skin Corr. 1C / Eye Dam. 1) depending on grade. It is not a typical cosmetic ingredient; no CIR monograph, and any inclusion in cosmetics would require a very dilute, buffered context. Can stain fabric and enamel.
Skin benefits
- Astringent and hemostatic effect in dental/professional use
- Iron source for specialty formulations
Known concerns
- Strongly acidic in solution — can irritate skin and eyes
- Corrosive at higher concentrations (GHS Skin Corr. 1C)
- Iron staining of fabrics and porcelain
- Rarely used in conventional cosmetics — more common in dental hemostats and industrial water treatment
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related ph adjusters
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.