Ingredient review
C30-50 Pareth-10
INCI: C30-50 PARETH-10
A mild, large-molecule surfactant that cleanses without stripping the skin barrier.
In plain English
C30-50 Pareth-10 is a gentle cleansing ingredient made from a very long fatty alcohol (30 to 50 carbon atoms) combined with a small number of ethylene oxide units. Because the molecule is large, it doesn't penetrate deeply into the skin, which makes it less likely to cause irritation or dryness. It helps water and oil mix together so that dirt and makeup can be rinsed away easily, and it's often used in products that claim to be mild or suitable for sensitive skin.
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
C30-50 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 C30-50 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 produced by reacting a long-chain fatty alcohol (C30–50) with about 10 units of ethylene oxide. The long carbon chain makes it milder than shorter-chain surfactants.
How it works
It reduces the surface tension between oil and water, allowing oils and dirt to be lifted from the skin and rinsed away. Its large molecular size limits absorption, so it stays on the skin's surface and cleanses without disrupting the moisture barrier.
Pros
Very gentle on skin
The large molecule size means it stays on the surface and doesn't penetrate, reducing the risk of irritation or dryness.
Effective emulsifier
It helps blend oils and water, making it great for removing makeup and sunscreen without harsh rubbing.
Cons and cautions
Low foam
It produces minimal lather, which may feel less satisfying for people who associate foam with cleanliness.
Ethoxylated ingredient
The manufacturing process involves ethylene oxide, which some consumers prefer to avoid due to potential trace impurities (though levels are tightly regulated).
Best for
- People with dry or sensitive skin who need a mild cleanser
- Anyone looking for a low-irritation makeup remover
Use caution if
- Those seeking a high-foam, deep-cleansing experience
- Individuals who strictly avoid ethoxylated ingredients
Usage tips
Safety summary
C30-50 Pareth-10 is considered safe for use in cosmetics. Its large molecular size limits skin penetration, and it has low irritation and sensitization potential. As with all ethoxylated ingredients, trace amounts of 1,4-dioxane can form during manufacturing, but levels are strictly controlled to meet safety standards.
Research notes
Studies on similar long-chain ethoxylated alcohols show low acute toxicity and minimal skin irritation. The Cosmetic Ingredient Review has deemed related ingredients safe when formulated to be non-irritating. No specific human clinical trials for C30-50 Pareth-10 were found, but its chemical class is well-studied.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on formulations
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar ethoxylated alcohols and found them safe at current usage levels.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- The long carbon chain makes it less water-soluble, so it biodegrades more slowly than shorter-chain surfactants, but it is still considered environmentally acceptable.
Good to know
- C30-50 Pareth-10 is often found in 'non-foaming' or 'low-foam' cleansers.
- It is considered biodegradable and safe for aquatic environments at typical use levels.
Common questions
What is C30-50 Pareth-10 in beauty products?
C30-50 Pareth-10 is a gentle cleansing ingredient made from a very long fatty alcohol (30 to 50 carbon atoms) combined with a small number of ethylene oxide units. Because the molecule is large, it doesn't penetrate deeply into the skin, which makes it less likely to cause irritation or dryness. It helps water and oil mix together so that dirt and makeup can be rinsed away easily, and it's often used in products that claim to be mild or suitable for sensitive skin.
What does C30-50 Pareth-10 do in a beauty product?
It reduces the surface tension between oil and water, allowing oils and dirt to be lifted from the skin and rinsed away. Its large molecular size limits absorption, so it stays on the skin's surface and cleanses without disrupting the moisture barrier.
Is C30-50 Pareth-10 safe for most people?
C30-50 Pareth-10 is considered safe for use in cosmetics. Its large molecular size limits skin penetration, and it has low irritation and sensitization potential. As with all ethoxylated ingredients, trace amounts of 1,4-dioxane can form during manufacturing, but levels are strictly controlled to meet safety standards.
Who should be careful with C30-50 Pareth-10?
Those seeking a high-foam, deep-cleansing experience Individuals who strictly avoid ethoxylated ingredients
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.