Specimen No. 0146
ClearedDerivedemulsifiersurfactant
Behentrimonium Methosulfate (BTMS)
behentrimonium methosulfate · btms · behentrimonium methosulfate and cetearyl alcohol
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.
medium confidence
Researched April 18, 2026Specimen 0146Behentrimonium Methosulfate (BTMS)
Concerns
- Environmental concern: quaternary ammonium compounds are toxic to aquatic organisms at high concentrations
Documented benefits
✓ plant-derived
Commonly found in
ConditionerHair maskLeave-in conditionerCo-wash
Sources & references
Last researched: April 18, 2026
Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.
Check another ingredient
Search our database of scored cosmetic, food, and household ingredients — or scan a full product label.
Open the Ingredient Lab