Preservative
Potassium nitrite
Safety score · 0–100
Avoid
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A nitrite salt prohibited from cosmetics in combination with amines because it readily forms carcinogenic nitrosamines. Even standalone, the EU treats it as a high-concern substance with strict Annex II restrictions.
Skin benefits
- Antimicrobial action in some industrial preservation
Known concerns
- Forms carcinogenic nitrosamines with secondary amines
- EU Annex II prohibits nitrites in cosmetics with secondary/tertiary amines
- Acutely toxic at moderate doses
- Methemoglobinemia risk on systemic exposure
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related preservatives
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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.