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Hair Conditioning

DIHYDROGENATED TALLOW HYDROXYETHYLMONIUM METHOSULFATE

55

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A tallow-derived cationic conditioner (quat) used in hair conditioners. Effective and cheap, but a moderate irritant at high levels with environmental persistence.

This is a quaternary ammonium compound built from hydrogenated tallow fatty acid chains linked via a hydroxyethyl group to a quaternary nitrogen, with a methosulfate counter-ion. It is a classic cationic hair conditioning agent — the dihydrogenated dialkyl quats deliver strong detangling and combing benefits on damaged hair. The class has been CIR-reviewed as safe in rinse-off and at limited concentrations in leave-on hair products. Concerns include eye and skin irritation potential at elevated concentrations, slow environmental biodegradation (long-chain di-alkyl quats are more persistent than mono-alkyl quats), and the tallow-animal-origin supply chain (BSE/TSE traceability required). Typical use 0.5-3% in rinse-off conditioner.

Skin benefits

  • Strong cationic conditioning agent for hair
  • Reduces combing friction and static
  • Substantive detangling performance
  • Compatible with most conditioner bases

Known concerns

  • Quaternary ammonium — moderate eye and skin irritant at high %
  • Tallow-derived — animal origin and potential BSE/TSE traceability concerns
  • Methosulfate leaving group
  • Long-chain quats are slow to biodegrade
  • Can cause buildup on hair

References

EU

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.