Ingredient review
C12-13 Pareth-2
INCI: C12-13 PARETH-2
A gentle, effective surfactant that helps cleanse without stripping the skin's natural moisture barrier.
In plain English
C12-13 Pareth-2 is a mild cleansing ingredient made from a blend of fatty alcohols (from coconut or palm oil) and ethylene oxide. It works as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Because it has a short ethoxylate chain (2 units), it is less likely to cause irritation or dryness compared to stronger cleansers like sodium lauryl sulfate. You'll find it in gentle cleansers, shampoos, and lotions where it helps create a smooth, stable texture.
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-2 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-2.
- 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 produced by reacting C12-13 fatty alcohols (derived from plant oils) with 2 moles of ethylene oxide. It belongs to the alcohol ethoxylate family and is known for its mildness.
How it works
In a cosmetic product, C12-13 Pareth-2 reduces the surface tension between water and oil, allowing them to blend into a stable emulsion. During cleansing, it surrounds dirt and oil particles so they can be lifted away from the skin and rinsed off with water. Its short ethoxylate chain makes it less aggressive on the skin barrier than many other surfactants.
Pros
Mild on skin
Its short ethoxylate chain makes it less likely to strip natural oils, helping maintain a healthy skin barrier.
Versatile formulator
Works well in both rinse-off and leave-on products, improving texture and stability without heavy foam.
Cons and cautions
Ethoxylation concerns
The manufacturing process can create trace amounts of 1,4-dioxane, a potential contaminant, though reputable brands keep levels well below safety limits.
Not fully natural
Despite being derived from plant oils, the ethoxylation step makes it semi-synthetic, which may not appeal to all-natural skincare fans.
Best for
- People with normal to dry skin looking for a mild cleanser
- Those who prefer sulfate-free or gentle cleansing formulas
Use caution if
- Individuals with known allergies to ethoxylated ingredients (rare)
- Those seeking completely natural or organic-only formulations
Usage tips
Safety summary
C12-13 Pareth-2 is considered safe for use in cosmetics at typical concentrations. It is a mild surfactant with low irritation and comedogenic potential. Trace 1,4-dioxane is a manufacturing impurity, but levels are regulated (e.g., FDA recommends below 10 ppm in cosmetics). Overall, it poses minimal risk for most users.
Research notes
Alcohol ethoxylates like C12-13 Pareth-2 have been studied for safety and efficacy. The CIR panel concluded they are safe as used. Research shows shorter ethoxylate chains are less irritating. No significant human health concerns have been identified from topical use at cosmetic levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. The Cosmetic Ingredient Review (CIR) panel has reviewed alcohol ethoxylates and found them safe as used, with limits on 1,4-dioxane content.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Derived from renewable plant oils (coconut or palm), but the ethoxylation process uses ethylene oxide from fossil fuels. Biodegradable, but palm sourcing may raise sustainability concerns.
Good to know
- C12-13 Pareth-2 is often part of a 'Pareth' series where the number indicates ethoxylation level; higher numbers (e.g., Pareth-7) are more water-soluble.
- It is biodegradable under standard wastewater treatment conditions.
Common questions
What is C12-13 Pareth-2 in beauty products?
C12-13 Pareth-2 is a mild cleansing ingredient made from a blend of fatty alcohols (from coconut or palm oil) and ethylene oxide. It works as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Because it has a short ethoxylate chain (2 units), it is less likely to cause irritation or dryness compared to stronger cleansers like sodium lauryl sulfate. You'll find it in gentle cleansers, shampoos, and lotions where it helps create a smooth, stable texture.
What does C12-13 Pareth-2 do in a beauty product?
In a cosmetic product, C12-13 Pareth-2 reduces the surface tension between water and oil, allowing them to blend into a stable emulsion. During cleansing, it surrounds dirt and oil particles so they can be lifted away from the skin and rinsed off with water. Its short ethoxylate chain makes it less aggressive on the skin barrier than many other surfactants.
Is C12-13 Pareth-2 safe for most people?
C12-13 Pareth-2 is considered safe for use in cosmetics at typical concentrations. It is a mild surfactant with low irritation and comedogenic potential. Trace 1,4-dioxane is a manufacturing impurity, but levels are regulated (e.g., FDA recommends below 10 ppm in cosmetics). Overall, it poses minimal risk for most users.
Who should be careful with C12-13 Pareth-2?
Individuals with known allergies to ethoxylated ingredients (rare) Those seeking completely natural or organic-only 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.