Antimicrobial
HYDROXYPROPYL BISTRIMONIUM DIIODIDE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A quaternary ammonium with an iodide counter-ion — antimicrobial and antistatic for hair-care. Quat class is broadly safe per CIR but iodide adds a small sensitization risk.
Function
Skin benefits
- Quaternary ammonium antimicrobial
- Antistatic / hair conditioning
- Iodine-bearing biocidal action
Known concerns
- Iodide load may sensitize iodine-allergic users
- Quats can cause contact dermatitis
- Less-studied than common trimoniums
- Higher concern in leave-on use
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related antimicrobials
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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.