Ingredient review
Undeceth-7
INCI: UNDECETH-7
Undeceth-7 is a gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, with a low risk of irritation.
In plain English
Undeceth-7 is a man-made ingredient that helps oil and water stay mixed together in products like face washes and lotions. It works by surrounding oil droplets so they can blend smoothly into water, which makes the product feel even and easy to rinse off. It is considered very gentle on skin and is unlikely to clog pores or cause irritation for most people.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Undeceth-7 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 Undeceth-7.
- 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
Undeceth-7 is a synthetic polyethylene glycol (PEG) ether of undecyl alcohol, used as a non-ionic surfactant and emulsifier in cosmetics.
How it works
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps cleansers remove dirt and oil effectively while rinsing cleanly without leaving a heavy residue.
Pros
Gentle on skin
Undeceth-7 is a mild surfactant that cleans without stripping the skin's natural moisture barrier, making it suitable for daily use.
Improves product texture
It helps create smooth, stable lotions and cleansers that feel pleasant and rinse off easily without greasiness.
Cons and cautions
Synthetic origin
It is derived from petroleum and ethylene oxide, which may be a concern for those seeking natural or eco-friendly products.
Potential trace impurities
During manufacturing, trace amounts of 1,4-dioxane (a possible carcinogen) can form, though reputable brands purify their ingredients to safe levels.
Best for
- People with normal to oily skin looking for a gentle cleanser
- Those who prefer synthetic but mild surfactants
Use caution if
- Individuals with known sensitivity to PEG compounds
- Those seeking fully natural or biodegradable formulas
Usage tips
Safety summary
Undeceth-7 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control for this.
Research notes
The Cosmetic Ingredient Review (CIR) panel reviewed PEG ethers and found them safe for cosmetic use. No significant human or animal studies indicate toxicity at typical exposure levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- As a synthetic PEG compound, it may not be readily biodegradable in aquatic environments. Look for brands that use purification steps to minimize environmental impact.
Good to know
- Undeceth-7 is often used in combination with other surfactants to reduce irritation
- It is considered safe by the Cosmetic Ingredient Review panel at typical use levels
Common questions
What is Undeceth-7 in beauty products?
Undeceth-7 is a man-made ingredient that helps oil and water stay mixed together in products like face washes and lotions. It works by surrounding oil droplets so they can blend smoothly into water, which makes the product feel even and easy to rinse off. It is considered very gentle on skin and is unlikely to clog pores or cause irritation for most people.
What does Undeceth-7 do in a beauty product?
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps cleansers remove dirt and oil effectively while rinsing cleanly without leaving a heavy residue.
Is Undeceth-7 safe for most people?
Undeceth-7 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control for this.
Who should be careful with Undeceth-7?
Individuals with known sensitivity to PEG compounds Those seeking fully natural or biodegradable formulas
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.