Researched by Helena DeMaria-Williams
Formula IngredientpH AdjusterTriethanolamine
INCI: Triethanolamine
Triethanolamine (TEA) is an alkaline compound used primarily as a pH adjuster and buffering agent in cosmetic formulations, where it neutralises acidic ingredients to bring the product to skin-compatible pH. It also functions as an emulsifier and surfactant, helping to stabilise oil-in-water mixtures. At 1% concentration it produces a solution of approximately pH 10, so it is used in very small quantities.
Category
pH Adjuster
Irritation Risk
Low
Skin Types
all skin types, oily, dry, combination, sensitive
What does this do in a formula?
pH stabilisation, emulsification, formulation stability, surfactant
Is Triethanolamine safe? Key considerations
Can Triethanolamine cause irritation?
Low RiskIrritancy rating of 0 on the INCIDecoder scale at typical cosmetic concentrations. The primary safety concern is not direct irritation but potential nitrosamine formation: when combined with N-nitrogenating preservatives (e.g. 2-Bromo-2-Nitropropane-1,3-Diol, sodium nitrate, or any ingredient containing 'nitra' or 'nitro'), TEA may form carcinogenic nitrosamines. Properly formulated products avoid this combination. EU Annex III (entry III/62) restricts its use and prohibits co-formulation with nitrosating agents.
Does Triethanolamine increase sun sensitivity?
No RiskTriethanolamine does not increase photosensitivity. No sun protection precautions are required based on its presence in a formulation.
Is Triethanolamine safe during pregnancy?
CautionMANUAL REVIEW: No established clinical pregnancy safety data from MotherToBaby or EWG was accessible during research. The precautionary concern relates to potential nitrosamine formation in poorly formulated products rather than TEA itself. At typical concentrations in well-formulated products it is generally considered low risk, but specific pregnancy guidance from a healthcare provider is advisable for frequent use.
How does Triethanolamine work?
Triethanolamine (TEA) is an alkaline compound used primarily as a pH adjuster and buffering agent in cosmetic formulations, where it neutralises acidic ingredients to bring the product to skin-compatible pH. It also functions as an emulsifier and surfactant, helping to stabilise oil-in-water mixtures. At 1% concentration it produces a solution of approximately pH 10, so it is used in very small quantities.
Individuals with acne-prone skin (in high-concentration leave-on products), products also containing nitrosating preservatives should review the considerations above before use.
Which products contain Triethanolamine?
Shop products that contain Triethanolamine
