Ingredient review
Triethyl Citrate
INCI: Triethyl Citrate
Triethyl citrate is a gentle, plant-derived solvent and plasticizer that helps products spread evenly and keeps formulas stable, with a low risk of irritation.
In plain English
Triethyl citrate is a colorless, mild-smelling liquid made from citric acid (found in citrus fruits) and ethanol. In cosmetics, it acts like a helper ingredient: it can dissolve other ingredients, make nail polish more flexible so it doesn't chip as easily, and help fragrances last longer on your skin. It's considered very gentle and is unlikely to cause breakouts or irritation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Triethyl Citrate is generally a lower-concern ingredient when the full formula suits your skin.
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 Triethyl Citrate.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
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
Triethyl citrate is the triethyl ester of citric acid, produced by reacting citric acid with ethanol. It appears as a clear, oily liquid with a faint, pleasant odor.
How it works
In cosmetics, triethyl citrate works primarily as a solvent (dissolving other ingredients) and a plasticizer (softening and increasing flexibility of films, like nail polish). It also helps stabilize fragrances by slowing evaporation, making scents last longer on the skin.
Pros
Gentle on skin
Triethyl citrate has a low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin types.
Improves product performance
It helps nail polish resist chipping and makes fragrances last longer, enhancing the user experience without harsh effects.
Cons and cautions
Not a direct skin benefit
Triethyl citrate is a formulation aid, not an active ingredient that hydrates, exfoliates, or treats skin conditions.
Potential mild irritation at high levels
In very high concentrations (above 10%), some individuals may experience slight stinging or redness, though this is uncommon in typical products.
Best for
- Anyone using nail polish or nail treatments
- People who prefer low-irritation solvents in their cosmetics
Use caution if
- Those with known allergy or sensitivity to citric acid esters (rare)
Usage tips
Safety summary
Triethyl citrate is considered safe for use in cosmetics at typical concentrations. It has low acute toxicity, is not a skin sensitizer, and is not known to be carcinogenic. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
Research notes
Studies confirm triethyl citrate's low irritation and sensitization potential. It is widely used in food and cosmetics with a long history of safe use. Research also supports its role as an effective plasticizer in nail products.
Common label clues
- Typical concentration
- Typically 0.1% to 5% in leave-on products; higher in nail polish removers
- Regulatory status
- Approved for use in cosmetics by the FDA and EU Cosmetic Regulation. No concentration restrictions in leave-on or rinse-off products.
- Common uses
- Nail products, Fragrances, Deodorants, Hair sprays
- Environmental note
- Triethyl citrate is biodegradable and derived from renewable resources (citric acid from citrus, ethanol from plants), making it a relatively eco-friendly choice.
Good to know
- Triethyl citrate is often used in natural and 'clean' beauty formulations as a plant-derived alternative to harsher solvents
- It is biodegradable and considered environmentally friendly
Common questions
What is Triethyl Citrate in beauty products?
Triethyl citrate is a colorless, mild-smelling liquid made from citric acid (found in citrus fruits) and ethanol. In cosmetics, it acts like a helper ingredient: it can dissolve other ingredients, make nail polish more flexible so it doesn't chip as easily, and help fragrances last longer on your skin. It's considered very gentle and is unlikely to cause breakouts or irritation.
What does Triethyl Citrate do in a beauty product?
In cosmetics, triethyl citrate works primarily as a solvent (dissolving other ingredients) and a plasticizer (softening and increasing flexibility of films, like nail polish). It also helps stabilize fragrances by slowing evaporation, making scents last longer on the skin.
Is Triethyl Citrate safe for most people?
Triethyl citrate is considered safe for use in cosmetics at typical concentrations. It has low acute toxicity, is not a skin sensitizer, and is not known to be carcinogenic. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
Who should be careful with Triethyl Citrate?
Those with known allergy or sensitivity to citric acid esters (rare)
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.