Behentrimonium Methosulfate (BTMS)
The question

Is Behentrimonium Methosulfate (BTMS) safe in hair mask?

ClearedHair mask

A plant-derived (rapeseed) quaternary emulsifier widely used in conditioning systems. Despite containing "sulfate" in its name, it is not a stripping sulfate — it conditions hair without buildup. Mild, gentle, and free of the sensitizing impurities associated with CAPB.

What the research flags

  • Environmental concern: quaternary ammonium compounds are toxic to aquatic organisms at high concentrations

Other hair mask ingredients on file

Sources & references

  1. [1]
    DatabaseIngredient database — 700658-BEHENTRIMONIUM_METHOSULFATE
  2. [2]
    DatabaseIngredient database
  3. [3]
    DatabaseIngredient database — behentrimonium-methosulfate

Research disclaimer: Ratings reflect peer-reviewed research and regulatory assessments available at the time of publication, not the dose or formulation of any specific hair mask product. This is not medical advice.