Ingredient review
C12-14 Sec-Pareth-30
INCI: C12-14 SEC-PARETH-30
An effective cleansing agent that can be drying or irritating for sensitive skin, but generally safe in well-formulated products.
In plain English
This ingredient is a type of synthetic detergent made from a secondary alcohol chain (C12-14) with 30 ethylene oxide units attached. It helps water mix with oils and dirt so they can be rinsed away. Because it has a long ethoxylate chain, it is milder than some traditional sulfates but can still strip natural oils if used in high amounts or without co-surfactants.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Main practical flags: irritation is moderate; clogging risk is low.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- moderate
- Clogging risk
- low
Quick decision guide
Useful, but context matters
C12-14 Sec-Pareth-30 can be useful, but watch for some irritation potential.
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 C12-14 Sec-Pareth-30.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
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 non-ionic surfactant derived from secondary alcohols (C12-14) and ethylene oxide. The '30' indicates 30 ethylene oxide units, making it relatively mild and water-soluble.
How it works
It reduces the surface tension between water and oil, allowing oily dirt and sebum to be emulsified and washed away. In creams and lotions, it helps stabilize the mixture of oil and water phases.
Pros
Good cleansing power
Effectively removes excess oil, makeup, and daily grime without the harshness of traditional sulfates.
Versatile emulsifier
Works well in both rinse-off cleansers and leave-on creams to keep formulas stable and smooth.
Cons and cautions
Potential for irritation
Can strip the skin's natural moisture barrier if used at high concentrations or without milder co-surfactants, leading to dryness or tightness.
Synthetic origin concerns
As an ethoxylated ingredient, it may contain trace levels of 1,4-dioxane (a potential carcinogen) unless the manufacturer purifies it thoroughly.
Best for
- People with normal to oily skin looking for a thorough cleanser
- Those who tolerate synthetic surfactants well
Use caution if
- Individuals with very dry, compromised, or eczema-prone skin
- Anyone seeking a completely natural or sulfate-free alternative
Usage tips
Safety summary
Generally recognized as safe for cosmetic use when properly formulated and purified. The main concern is potential skin irritation and trace impurities from the manufacturing process. Regulatory bodies set limits on 1,4-dioxane to ensure consumer safety.
Research notes
Studies show that secondary alcohol ethoxylates are effective surfactants with lower aquatic toxicity than some linear counterparts. Human patch tests indicate moderate irritation potential, which can be mitigated by formulation adjustments.
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, Emulsions
- Environmental note
- Ethoxylated surfactants can be slow to biodegrade in some conditions, but modern formulations often use biodegradable versions.
Good to know
- The 'sec' in the name stands for 'secondary,' meaning the alcohol backbone has a branched structure, which can affect how it interacts with skin.
- Many brands now use this ingredient as a gentler alternative to sodium lauryl sulfate (SLS).
Common questions
What is C12-14 Sec-Pareth-30 in beauty products?
This ingredient is a type of synthetic detergent made from a secondary alcohol chain (C12-14) with 30 ethylene oxide units attached. It helps water mix with oils and dirt so they can be rinsed away. Because it has a long ethoxylate chain, it is milder than some traditional sulfates but can still strip natural oils if used in high amounts or without co-surfactants.
What does C12-14 Sec-Pareth-30 do in a beauty product?
It reduces the surface tension between water and oil, allowing oily dirt and sebum to be emulsified and washed away. In creams and lotions, it helps stabilize the mixture of oil and water phases.
Is C12-14 Sec-Pareth-30 safe for most people?
Generally recognized as safe for cosmetic use when properly formulated and purified. The main concern is potential skin irritation and trace impurities from the manufacturing process. Regulatory bodies set limits on 1,4-dioxane to ensure consumer safety.
Who should be careful with C12-14 Sec-Pareth-30?
Individuals with very dry, compromised, or eczema-prone skin Anyone seeking a completely natural or sulfate-free alternative
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.