Ingredient review
Sodium C9-22 Alkyl Sec Sulfonate
INCI: SODIUM C9-22 ALKYL SEC SULFONATE
A gentle, effective cleanser that removes dirt and oil without stripping the skin, making it a good alternative to harsher sulfates.
In plain English
This ingredient is a type of detergent that helps water mix with oil and dirt so they can be rinsed away. It's known for being milder than common sulfates like sodium lauryl sulfate, so it cleans without leaving your skin feeling tight or dry. You'll find it in many gentle face washes and body cleansers.
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
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium C9-22 Alkyl Sec Sulfonate 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 Sodium C9-22 Alkyl Sec Sulfonate.
- 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 synthetic surfactant derived from petroleum or natural gas, chemically modified to create a stable, mild cleansing agent. It belongs to the secondary alkane sulfonate family.
How it works
It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin. The molecule has a water-loving head and an oil-loving tail, which traps grime so it can be rinsed away easily.
Pros
Mild on skin
Less irritating than sodium lauryl sulfate, making it suitable for daily use on most skin types.
Hard water friendly
Maintains its cleansing power even in hard water, so you get a good lather and rinse without residue.
Cons and cautions
Synthetic origin
Derived from petrochemicals, which may be a concern for those preferring natural or plant-based ingredients.
Potential for dryness
At high concentrations or with frequent use, it can still strip natural oils, especially on already dry skin.
Best for
- People with normal to combination skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals with extremely dry or compromised skin barriers
- Anyone seeking a completely natural ingredient list
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation potential, but like all cleansers, overuse may disrupt the skin barrier. Not known to be comedogenic.
Research notes
Studies show secondary alkane sulfonates are milder than linear alkylbenzene sulfonates and have good skin compatibility. They are widely used in personal care and are well-tolerated.
Common label clues
- Typical concentration
- 1–15% in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no concentration restrictions for rinse-off products.
- Common uses
- Facial cleansers, Body washes, Shampoos, Shower gels
- Environmental note
- Biodegradable, but its petrochemical origin means it has a higher carbon footprint compared to plant-derived surfactants.
Good to know
- Often labeled as 'sulfate-free' because it is not a traditional sulfate like SLS or SLES.
- Biodegradable under standard wastewater treatment conditions.
Common questions
What is Sodium C9-22 Alkyl Sec Sulfonate in beauty products?
This ingredient is a type of detergent that helps water mix with oil and dirt so they can be rinsed away. It's known for being milder than common sulfates like sodium lauryl sulfate, so it cleans without leaving your skin feeling tight or dry. You'll find it in many gentle face washes and body cleansers.
What does Sodium C9-22 Alkyl Sec Sulfonate do in a beauty product?
It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin. The molecule has a water-loving head and an oil-loving tail, which traps grime so it can be rinsed away easily.
Is Sodium C9-22 Alkyl Sec Sulfonate safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation potential, but like all cleansers, overuse may disrupt the skin barrier. Not known to be comedogenic.
Who should be careful with Sodium C9-22 Alkyl Sec Sulfonate?
Individuals with extremely dry or compromised skin barriers Anyone seeking a completely natural ingredient list
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.