pH Adjuster
Oxalic acid, its esters and alkaline salts
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A small dicarboxylic acid. Toxic if ingested and irritating; EU restricts it to professional hair-care use only at up to 5%, banned in consumer products.
Skin benefits
- Used historically in hair products by professionals
- Chelating effect on metal ions
Known concerns
- EU Annex III: restricted to professional hair-care, max 5%
- Toxic if ingested (kidney damage)
- Skin/eye irritation
- Not for general cosmetic use
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.