Ingredient review
C12-13 Pareth-4
INCI: C12-13 PARETH-4
A gentle, low-irritation surfactant that helps cleanse and emulsify without stripping the skin.
In plain English
C12-13 Pareth-4 is a mild cleansing ingredient made from fatty alcohols (from natural oils) and ethylene oxide. It helps water and oil mix together, so it can remove dirt, makeup, and excess oil without being harsh. Think of it as a gentle soap alternative that cleans without leaving 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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
C12-13 Pareth-4 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-4.
- 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 belonging to the alcohol ethoxylate family. It is produced by reacting a blend of C12-13 fatty alcohols with 4 moles of ethylene oxide, resulting in a water-soluble molecule that reduces surface tension.
How it works
It lowers the surface tension between water and oil, allowing them to blend. This helps lift dirt, sebum, and makeup from the skin so they can be rinsed away. Its mildness comes from its balanced hydrophilic-lipophilic structure, which cleans effectively without over-stripping the skin barrier.
Pros
Mild on skin
C12-13 Pareth-4 is much gentler than sodium lauryl sulfate, making it suitable for daily use without stripping natural oils.
Versatile emulsifier
It helps blend water and oil in creams and lotions, improving texture and stability without heavy greasiness.
Cons and cautions
Potential trace impurities
As an ethoxylated ingredient, it may contain trace amounts of 1,4-dioxane if not properly purified. Reputable manufacturers remove this during processing.
Not fully natural
Although derived from natural fatty alcohols, the ethoxylation process is synthetic, which may not appeal to 'clean beauty' enthusiasts.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer sulfate-free or low-foam cleansing options
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients (rare)
Usage tips
Safety summary
C12-13 Pareth-4 is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. The main concern is trace 1,4-dioxane, which is regulated and minimized in well-manufactured products.
Research notes
Studies on alcohol ethoxylates show they are mild surfactants with low acute toxicity. The Cosmetic Ingredient Review (CIR) panel has reviewed similar ethoxylates and found them safe as used. No specific long-term human studies for C12-13 Pareth-4 were identified, but its class is well-characterized.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics globally, including by the EU CosIng database and the US FDA (as an indirect additive). Manufacturers must ensure low 1,4-dioxane levels per ICH guidelines.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- Alcohol ethoxylates are generally biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels. Some eco-conscious brands may avoid ethoxylated ingredients.
Good to know
- The '4' in the name refers to the number of ethylene oxide units, which determines its water solubility and mildness.
- It is often used in baby shampoos and sensitive-skin cleansers due to its low irritation profile.
Common questions
What is C12-13 Pareth-4 in beauty products?
C12-13 Pareth-4 is a mild cleansing ingredient made from fatty alcohols (from natural oils) and ethylene oxide. It helps water and oil mix together, so it can remove dirt, makeup, and excess oil without being harsh. Think of it as a gentle soap alternative that cleans without leaving your skin feeling tight or dry.
What does C12-13 Pareth-4 do in a beauty product?
It lowers the surface tension between water and oil, allowing them to blend. This helps lift dirt, sebum, and makeup from the skin so they can be rinsed away. Its mildness comes from its balanced hydrophilic-lipophilic structure, which cleans effectively without over-stripping the skin barrier.
Is C12-13 Pareth-4 safe for most people?
C12-13 Pareth-4 is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential. The main concern is trace 1,4-dioxane, which is regulated and minimized in well-manufactured products.
Who should be careful with C12-13 Pareth-4?
Individuals with known sensitivity to ethoxylated ingredients (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.