Ingredient review
C12-13 Pareth-10
INCI: C12-13 PARETH-10
A gentle, effective surfactant that helps cleanse and emulsify without stripping the skin.
In plain English
C12-13 Pareth-10 is a mild cleansing ingredient made from fatty alcohols and ethylene oxide. It helps water and oil mix together so that dirt, makeup, and excess oil can be rinsed away easily. Because it's less harsh than traditional sulfates, it's often used in gentler cleansers and shampoos.
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-10 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-10.
- 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. The 'C12-13' refers to the carbon chain length of the fatty alcohol, and 'Pareth-10' indicates the average number of ethylene oxide units (10) attached.
How it works
It lowers the surface tension between water and oil, allowing them to blend. This helps lift dirt and oil from the skin or hair so they can be washed away with water. Its mildness comes from its balanced hydrophilic-lipophilic structure, which cleanses without over-stripping natural oils.
Pros
Mild on skin
Less stripping than traditional sulfates, making it suitable for daily use and sensitive skin types.
Effective emulsifier
Helps blend oils and water, improving the texture and performance of cleansers and makeup removers.
Cons and cautions
Ethoxylation concerns
The manufacturing process can create trace amounts of 1,4-dioxane, a potential contaminant, though reputable brands purify to safe levels.
Not fully natural
Despite being derived from natural fatty alcohols, the ethoxylation step makes it semi-synthetic, which may not appeal to all-natural product fans.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Those who prefer sulfate-free or milder cleansing options
Use caution if
- Individuals with known sensitivity to ethoxylated ingredients (rare)
Usage tips
Safety summary
C12-13 Pareth-10 is considered safe for use in cosmetics at typical concentrations. The main concern is potential 1,4-dioxane contamination, but reputable manufacturers purify their ingredients to meet safety standards. Skin irritation is rare and usually mild.
Research notes
Alcohol ethoxylates like C12-13 Pareth-10 have been reviewed by the Cosmetic Ingredient Review (CIR) panel and found safe for use in cosmetics. Studies show low acute toxicity and minimal skin irritation at typical use levels.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Manufacturers are expected to keep 1,4-dioxane levels low (typically below 10 ppm).
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- Alcohol ethoxylates are generally biodegradable, but the ethoxylation process uses ethylene oxide, which is derived from fossil fuels.
Good to know
- Often found in sulfate-free formulations as a primary or secondary surfactant.
- The '10' in the name refers to the average ethylene oxide units, which influences its water solubility and mildness.
Common questions
What is C12-13 Pareth-10 in beauty products?
C12-13 Pareth-10 is a mild cleansing ingredient made from fatty alcohols and ethylene oxide. It helps water and oil mix together so that dirt, makeup, and excess oil can be rinsed away easily. Because it's less harsh than traditional sulfates, it's often used in gentler cleansers and shampoos.
What does C12-13 Pareth-10 do in a beauty product?
It lowers the surface tension between water and oil, allowing them to blend. This helps lift dirt and oil from the skin or hair so they can be washed away with water. Its mildness comes from its balanced hydrophilic-lipophilic structure, which cleanses without over-stripping natural oils.
Is C12-13 Pareth-10 safe for most people?
C12-13 Pareth-10 is considered safe for use in cosmetics at typical concentrations. The main concern is potential 1,4-dioxane contamination, but reputable manufacturers purify their ingredients to meet safety standards. Skin irritation is rare and usually mild.
Who should be careful with C12-13 Pareth-10?
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.