Ingredient review
C12-13 Pareth-6
INCI: C12-13 PARETH-6
A gentle, effective surfactant that helps cleanse without stripping the skin, making it a common choice for mild formulas.
In plain English
C12-13 Pareth-6 is a mild cleansing ingredient made from fatty alcohols and ethylene oxide. It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional harsh soaps. You'll find it in cleansers and shampoos that aim to clean without leaving skin feeling tight or dry.
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
C12-13 Pareth-6 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 C12-13 Pareth-6.
- 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
A semi-synthetic surfactant and emulsifier from the 'pareth' family, produced by reacting C12-13 fatty alcohols with 6 units of ethylene oxide. It belongs to a class of non-ionic surfactants known for their mildness and compatibility with other ingredients.
How it works
It lowers the surface tension between water and oil, allowing them to blend into a stable emulsion. In cleansers, it surrounds dirt and oil particles so they can be lifted away and rinsed off without harsh scrubbing. Its non-ionic nature means it works well in a wide range of pH levels and is less likely to irritate sensitive skin.
Pros
Mild on skin
Unlike harsh sulfates, C12-13 Pareth-6 cleanses effectively without over-drying, making it suitable for daily use on normal to dry skin.
Versatile formulator
It works well in both rinse-off and leave-on products, helping to create smooth, stable emulsions that feel pleasant on the skin.
Cons and cautions
Synthetic origin
It is semi-synthetic and produced via ethoxylation, which may not appeal to those seeking exclusively natural or organic ingredients.
Potential trace impurities
Ethoxylation can produce trace amounts of 1,4-dioxane (a potential contaminant), though reputable manufacturers purify to safe levels.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer mild, non-stripping surfactants in their daily routine
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those seeking 100% natural or plant-derived-only formulas
Usage tips
Safety summary
C12-13 Pareth-6 is considered safe for use in cosmetics at typical concentrations. It is a mild surfactant with low irritation and comedogenic risk. As with all ethoxylated ingredients, quality control is important to minimize trace contaminants.
Research notes
Studies on similar pareth surfactants show they are well-tolerated on skin and less irritating than traditional sulfates. The Cosmetic Ingredient Review (CIR) panel has reviewed related ethoxylated alcohols and deemed them safe for cosmetic use when formulated properly.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. Manufacturers must ensure purity and limit 1,4-dioxane to safe levels (typically below 10 ppm).
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Biodegradability varies; some ethoxylated surfactants can break down slowly in aquatic environments. Look for brands that prioritize eco-friendly processing.
Good to know
- The '6' in the name refers to the average number of ethylene oxide units, which influences its water solubility and mildness.
- It is often used in 'sulfate-free' formulas as a gentler alternative to sodium lauryl sulfate.
Common questions
What is C12-13 Pareth-6 in beauty products?
C12-13 Pareth-6 is a mild cleansing ingredient made from fatty alcohols and ethylene oxide. It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional harsh soaps. You'll find it in cleansers and shampoos that aim to clean without leaving skin feeling tight or dry.
What does C12-13 Pareth-6 do in a beauty product?
It lowers the surface tension between water and oil, allowing them to blend into a stable emulsion. In cleansers, it surrounds dirt and oil particles so they can be lifted away and rinsed off without harsh scrubbing. Its non-ionic nature means it works well in a wide range of pH levels and is less likely to irritate sensitive skin.
Is C12-13 Pareth-6 safe for most people?
C12-13 Pareth-6 is considered safe for use in cosmetics at typical concentrations. It is a mild surfactant with low irritation and comedogenic risk. As with all ethoxylated ingredients, quality control is important to minimize trace contaminants.
Who should be careful with C12-13 Pareth-6?
Individuals with known allergies to ethoxylated ingredients (rare) Those seeking 100% natural or plant-derived-only 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.