Soytrimonium Chloride
molecular structure · PubChem
AKA: Soybean Trimonium Chloride, Soy Quaternary
Allergen Warning
⚠️ Soy
Synthetic
Preservative
Cleanser
Emulsifier
Skin Conditioner
Hair Care
Not Clean
Quaternary ammonium compounds, trimethylsoya alkyl, chlorides
CAS #
61790-41-8
Functions
Antistatic
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Reduces Static
Conditions Hair
Preserves Formula
Cleansing Surfactant
Traditional Use
Modern cationic conditioning agent derived from soybean protein. Created in the late 20th century as a plant-based alternative to synthetic quaternary ammonium compounds, designed to provide hair conditioning benefits inspired by the protein-rich composition of soybeans.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR