Ingredient review
Sodium C13-15 Pareth-3 Sulfate
INCI: Sodium C13-15 Pareth-3 Sulfate
A milder alternative to sodium lauryl sulfate that still provides good foam and cleansing, but may still be drying for sensitive skin.
In plain English
This is a synthetic ingredient that helps water mix with oil and dirt so they can be rinsed away. It creates the lather you expect from a cleanser. Compared to stronger sulfates, it is considered gentler on the skin, but it can still strip natural oils if used too frequently or left on the skin too long.
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
Sodium C13-15 Pareth-3 Sulfate 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 Sodium C13-15 Pareth-3 Sulfate.
- 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 sodium salt of a sulfated ethoxylated alcohol derived from synthetic fatty alcohols (C13-15). It belongs to the alkyl ether sulfate family, similar to sodium laureth sulfate but with a different carbon chain length.
How it works
It lowers the surface tension between water and oils, allowing them to mix. This helps lift dirt, sebum, and makeup from the skin or hair so they can be washed away with water. The 'pareth-3' part indicates it has been ethoxylated, which makes it milder than non-ethoxylated sulfates.
Pros
Gentler than SLS
The ethoxylation process makes this surfactant less harsh on skin than sodium lauryl sulfate, reducing the risk of irritation for many users.
Effective foamer
It produces a rich, stable lather that many people associate with a satisfying cleansing experience, especially in shampoos and body washes.
Cons and cautions
Still potentially drying
Despite being milder than SLS, it can still strip the skin's natural moisture barrier if used too frequently or in high concentrations, leading to tightness or dryness.
Synthetic origin
It is derived from petrochemicals, which may be a concern for consumers seeking natural or biodegradable ingredients.
Best for
- People with normal to oily skin looking for a foaming cleanser
- Those who prefer a sulfate that is gentler than SLS but still effective
Use caution if
- Individuals with very dry, compromised, or eczema-prone skin
- Anyone seeking a completely sulfate-free or all-natural routine
Usage tips
Safety summary
Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild to moderate skin irritation is possible, especially for sensitive individuals. Eye irritation is also possible if product gets into eyes. No evidence of carcinogenicity or systemic toxicity from topical use.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have evaluated alkyl ether sulfates and found them safe for cosmetic use when formulated properly. Studies show that ethoxylation reduces irritation potential compared to non-ethoxylated sulfates. Individual sensitivity varies.
Common label clues
- Typical concentration
- 1% to 15% depending on product type
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. Concentrations are typically limited to ensure safety, and it is subject to standard cosmetic ingredient regulations.
- Common uses
- Shampoos, Body washes, Facial cleansers, Liquid soaps
- Environmental note
- As a synthetic surfactant, it may have moderate biodegradability. Some studies suggest ethoxylated sulfates can be less eco-friendly than plant-based alternatives, but formulations vary.
Good to know
- This ingredient is often found in 'sulfate-free' formulas that still contain mild sulfates, so always check the full ingredient list.
- The 'C13-15' refers to the carbon chain length, which influences its cleansing strength and mildness.
Common questions
What is Sodium C13-15 Pareth-3 Sulfate in beauty products?
This is a synthetic ingredient that helps water mix with oil and dirt so they can be rinsed away. It creates the lather you expect from a cleanser. Compared to stronger sulfates, it is considered gentler on the skin, but it can still strip natural oils if used too frequently or left on the skin too long.
What does Sodium C13-15 Pareth-3 Sulfate do in a beauty product?
It lowers the surface tension between water and oils, allowing them to mix. This helps lift dirt, sebum, and makeup from the skin or hair so they can be washed away with water. The 'pareth-3' part indicates it has been ethoxylated, which makes it milder than non-ethoxylated sulfates.
Is Sodium C13-15 Pareth-3 Sulfate safe for most people?
Generally recognized as safe for use in rinse-off cosmetics at typical concentrations. Mild to moderate skin irritation is possible, especially for sensitive individuals. Eye irritation is also possible if product gets into eyes. No evidence of carcinogenicity or systemic toxicity from topical use.
Who should be careful with Sodium C13-15 Pareth-3 Sulfate?
Individuals with very dry, compromised, or eczema-prone skin Anyone seeking a completely sulfate-free or all-natural routine
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.