Triethanolamine
Organic amine used as a pH adjuster and emulsifier. Neutralises acidic polymers (carbomers) allowing them to form gels. Historically ubiquitous, but due to possible nitrosamine formation on contact with nitrites, some manufacturers moved to alternatives – aminomethyl propanol, trometamol. Safe when formulated correctly.
Evidence by route
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional pH adjuster. No standalone skin effect. Yellow rating reflects the historically discussed nitrosamine issue (arises only in formulas with nitrite sources; modern formulations avoid this). With a clean formulation the ingredient is safe.
- Cosmetic Ingredient Review (CIR). Safety assessment of triethanolamine. 2013.
- SCCS Opinion on Triethanolamine (SCCS/1606/19). 2019.
Tolerability and safety
Irritation potential
LowAllergen risk
LowPregnancy
SafeSkin types
Suitable for
Use with caution
Frequently asked questions
Is Triethanolamine safe during pregnancy?
Triethanolamine is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Triethanolamine for?
Triethanolamine suits: normal, dry, combination, oily. Use with caution in: sensitive.