Ingredient review
Triethanolamine
INCI: Triethanolamine
Triethanolamine is a common pH adjuster that helps formulas feel balanced, but it can be irritating for sensitive skin at higher concentrations.
In plain English
Triethanolamine, often shortened to TEA, is a synthetic ingredient used to tweak the pH of skincare products so they're gentle on your skin. It also helps oil and water mix together, which is why you'll find it in creamy cleansers and lotions. Think of it as a behind-the-scenes helper that keeps the formula stable and comfortable to use.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Triethanolamine can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Triethanolamine.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Triethanolamine is an organic compound made from ethylene oxide and ammonia. In cosmetics, it's used primarily as a pH adjuster to lower acidity and as an emulsifier to blend ingredients that don't normally mix, like oil and water.
How it works
Triethanolamine works by neutralizing acidic ingredients in a formula, bringing the pH to a skin-friendly level (usually around 5.5–7). It also reduces surface tension between oil and water, allowing them to form a stable, creamy emulsion that feels smooth on the skin.
Pros
Balances pH effectively
Triethanolamine helps adjust the pH of skincare products to a level that's gentle on your skin, reducing the risk of stinging or irritation from overly acidic formulas.
Improves product texture
By acting as an emulsifier, TEA helps create smooth, creamy textures that spread easily and feel pleasant on the skin, enhancing your overall experience.
Cons and cautions
Potential irritant for sensitive skin
At higher concentrations, triethanolamine can cause redness, itching, or stinging, especially for those with sensitive or compromised skin barriers.
Nitrosamine concern
Under certain conditions, TEA can react with nitrosating agents (like some preservatives) to form nitrosamines, which are potential carcinogens. However, reputable brands avoid this by using proper formulations.
Best for
- People with normal to oily skin looking for stable, well-formulated products
- Those using rinse-off cleansers where TEA helps create a gentle pH
Use caution if
- Individuals with very sensitive, reactive, or eczema-prone skin
- Anyone with a known allergy to triethanolamine or related amines
Usage tips
Safety summary
Triethanolamine is considered safe in well-formulated products at typical concentrations. The main concerns are skin irritation for sensitive individuals and the potential formation of nitrosamines, which is minimized by avoiding nitrosating agents in the formula. Regulatory bodies like the CIR and EU have set safety guidelines.
Research notes
Research shows triethanolamine is an effective pH adjuster and emulsifier with low acute toxicity. Studies on nitrosamine formation are primarily related to industrial exposure, not cosmetic use. The CIR panel has reviewed it multiple times and reaffirmed its safety within recommended limits.
Common label clues
- Typical concentration
- Usually under 2% in leave-on products, up to 5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, with concentration limits recommended by the Cosmetic Ingredient Review (CIR) panel. The EU allows TEA but restricts its use in products that may be ingested or inhaled.
- Common uses
- Cleansers, Sunscreens, Moisturizers, Makeup removers
- Environmental note
- Triethanolamine is synthetic and not biodegradable in all conditions, but it is used in low concentrations and is generally considered low-risk for the environment when rinsed off.
Good to know
- Triethanolamine is often listed as 'TEA' on ingredient labels.
- It's considered safe by the Cosmetic Ingredient Review (CIR) panel at concentrations up to 5% in rinse-off products and 2.5% in leave-on products.
- The European Union restricts TEA in certain products to ensure safety.
Common questions
What is Triethanolamine in beauty products?
Triethanolamine, often shortened to TEA, is a synthetic ingredient used to tweak the pH of skincare products so they're gentle on your skin. It also helps oil and water mix together, which is why you'll find it in creamy cleansers and lotions. Think of it as a behind-the-scenes helper that keeps the formula stable and comfortable to use.
What does Triethanolamine do in a beauty product?
Triethanolamine works by neutralizing acidic ingredients in a formula, bringing the pH to a skin-friendly level (usually around 5.5–7). It also reduces surface tension between oil and water, allowing them to form a stable, creamy emulsion that feels smooth on the skin.
Is Triethanolamine safe for most people?
Triethanolamine is considered safe in well-formulated products at typical concentrations. The main concerns are skin irritation for sensitive individuals and the potential formation of nitrosamines, which is minimized by avoiding nitrosating agents in the formula. Regulatory bodies like the CIR and EU have set safety guidelines.
Who should be careful with Triethanolamine?
Individuals with very sensitive, reactive, or eczema-prone skin Anyone with a known allergy to triethanolamine or related amines
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.