Hair Conditioning
HYDROXYLAMINE HCL
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A reducing agent in hair dyes. EU law restricts its use because it is a suspected carcinogen and a skin sensitizer.
Hydroxylamine hydrochloride (CAS 5470-11-1) is the chloride salt of hydroxylamine, used in cosmetic hair colour as a reducing agent / antioxidant to stabilise the formulation and manage oxidation during application. Its EU CLP harmonised classification includes Carc. 2 (H351, suspected of causing cancer), Muta. 2, Acute Tox. 4, STOT RE 2, Skin Sens. 1, and Skin/Eye Irritation. EU Cosmetics Regulation Annex III entry 212 restricts hydroxylamine, its salts and HCl salts to hair-product use, typically at ≤1% in hair-dye products (for specific uses) with further conditions. Consumers with hair-dye sensitivity should be aware that this ingredient contributes to the sensitization burden.
Skin benefits
- Formulation stabiliser in oxidative hair dyes
Known concerns
- CLP Carc. 2 suspected carcinogen
- Skin sensitizer and irritant
- Annex III concentration restriction
- Aggressive handling hazards
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related hair conditionings
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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.