Ingredient review
C12-13 Pareth-3
INCI: C12-13 PARETH-3
A gentle synthetic surfactant that helps cleanse without stripping the skin, but may not be suitable for ultra-sensitive skin in high concentrations.
In plain English
C12-13 Pareth-3 is a man-made ingredient that helps water and oil mix together, making it easier to wash away dirt and makeup. It's a milder alternative to harsher cleansers like sodium lauryl sulfate, so it's less likely to leave your 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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
C12-13 Pareth-3 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-3.
- 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
C12-13 Pareth-3 is a synthetic surfactant (a type of cleansing agent) made by reacting a fatty alcohol (C12-13) with ethylene oxide. It belongs to the 'pareth' family of ethoxylated alcohols, which are known for their gentle cleansing and emulsifying properties.
How it works
In a cosmetic product, C12-13 Pareth-3 reduces the surface tension between water and oil, allowing them to blend into a stable mixture. This helps rinse away oily impurities like sebum and sunscreen while being mild enough not to disrupt the skin's natural moisture barrier.
Pros
Mild on skin
C12-13 Pareth-3 is less irritating than traditional sulfates, making it a good choice for daily cleansing without stripping natural oils.
Versatile formulator
It works well in both rinse-off and leave-on products, helping create smooth, stable textures in creams and lotions.
Cons and cautions
Potential trace contaminant
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane if not properly purified. Reputable manufacturers typically remove this during processing.
Not natural
It is synthetically produced, which may not appeal to consumers seeking plant-based or naturally derived alternatives.
Best for
- People with normal to combination skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients
- Those seeking 100% natural formulations
Usage tips
Safety summary
C12-13 Pareth-3 is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but this is tightly controlled by quality manufacturing. It has low irritation and comedogenic potential.
Research notes
Studies on ethoxylated alcohols show they are generally mild and well-tolerated. The Cosmetic Ingredient Review (CIR) panel has reviewed similar pareth ingredients and found them safe for use in rinse-off and leave-on products when formulated properly.
Common label clues
- Typical concentration
- 1–5% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. Manufacturers are expected to keep 1,4-dioxane levels below 10 ppm (often much lower).
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Ethoxylated surfactants can be biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels. Some brands choose plant-based alternatives for sustainability.
Good to know
- C12-13 Pareth-3 is often used in sulfate-free formulations.
- The '3' refers to the average number of ethylene oxide units, which influences its water solubility.
Common questions
What is C12-13 Pareth-3 in beauty products?
C12-13 Pareth-3 is a man-made ingredient that helps water and oil mix together, making it easier to wash away dirt and makeup. It's a milder alternative to harsher cleansers like sodium lauryl sulfate, so it's less likely to leave your skin feeling tight or dry.
What does C12-13 Pareth-3 do in a beauty product?
In a cosmetic product, C12-13 Pareth-3 reduces the surface tension between water and oil, allowing them to blend into a stable mixture. This helps rinse away oily impurities like sebum and sunscreen while being mild enough not to disrupt the skin's natural moisture barrier.
Is C12-13 Pareth-3 safe for most people?
C12-13 Pareth-3 is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but this is tightly controlled by quality manufacturing. It has low irritation and comedogenic potential.
Who should be careful with C12-13 Pareth-3?
Individuals with known sensitivity to ethoxylated ingredients Those seeking 100% natural formulations
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.