Preservative
POTASSIUM METABISULFITE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A sulfite-based reducing agent and preservative used to stop oxidation and microbial spoilage. Generally tolerated, but can trigger serious reactions in the small share of people who are sulfite-sensitive (often asthmatics).
Function
Skin benefits
- Effective antioxidant and reducing agent
- Antimicrobial activity against bacteria and fungi
- Stabilizes color and prevents browning
- Long history of use as food and cosmetic preservative
Known concerns
- Sulfite-sensitive individuals (asthmatics) can react severely
- Potential to release sulfur dioxide gas
- Skin and respiratory irritation in concentrated forms
- Subject to labeling requirements as a sulfite
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.