Ingredient review
Sodium Stearoamphohydroxypropylsulfonate
INCI: Sodium Stearoamphohydroxypropylsulfonate
A gentle, sulfate-free surfactant that cleanses without stripping the skin, making it ideal for sensitive or dry skin types.
In plain English
This ingredient is a mild cleansing agent that helps remove dirt and oil from your skin and hair without causing irritation. It's often used in sulfate-free formulas because it creates a nice lather but is much gentler than traditional sulfates like SLS. Think of it as a kinder, softer way to get clean.
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 Stearoamphohydroxypropylsulfonate 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 Stearoamphohydroxypropylsulfonate.
- 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
Sodium Stearoamphohydroxypropylsulfonate is a synthetic, amphoteric surfactant derived from stearic acid (a fatty acid). It is part of the amphoacetate family and is known for its mildness and compatibility with other cleansing ingredients.
How it works
It works by lowering the surface tension between water and oil, allowing dirt and sebum to be rinsed away. Because it is amphoteric (can act as either an acid or a base), it remains gentle on the skin's natural barrier while still providing effective cleansing and foam.
Pros
Very gentle on skin
Unlike harsh sulfates, this surfactant cleanses without stripping the skin's natural oils, reducing the risk of dryness and irritation.
Great for sensitive formulas
Its low irritation profile makes it a popular choice for baby washes, facial cleansers, and products for eczema-prone skin.
Cons and cautions
Synthetic origin
It is not a naturally derived ingredient, which may be a drawback for consumers seeking plant-based or 'clean' beauty products.
Potential for slight drying at high levels
In some rinse-off formulations with very high surfactant concentrations, it may still contribute to a tight feeling after washing, though much less than traditional sulfates.
Best for
- People with sensitive or easily irritated skin
- Those looking for a sulfate-free cleanser that still lathers well
Use caution if
- Individuals who strictly avoid all synthetic ingredients
Usage tips
Safety summary
Sodium Stearoamphohydroxypropylsulfonate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Research notes
While not extensively studied in isolation, the broader class of amphoacetate surfactants is well-documented for mildness and low irritation. Safety assessments by the Cosmetic Ingredient Review (CIR) have supported the use of similar amphoteric surfactants in rinse-off products.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Facial cleansers, Body washes, Shampoos, Baby care products
- Environmental note
- As a synthetic surfactant, its biodegradability is moderate. It is not known to be a significant environmental concern, but natural alternatives may have a lower ecological footprint.
Good to know
- This ingredient is often listed near the middle or end of an ingredient list because it is used at moderate concentrations.
- It is compatible with both acidic and alkaline formulations, making it versatile for different product pH levels.
Common questions
What is Sodium Stearoamphohydroxypropylsulfonate in beauty products?
This ingredient is a mild cleansing agent that helps remove dirt and oil from your skin and hair without causing irritation. It's often used in sulfate-free formulas because it creates a nice lather but is much gentler than traditional sulfates like SLS. Think of it as a kinder, softer way to get clean.
What does Sodium Stearoamphohydroxypropylsulfonate do in a beauty product?
It works by lowering the surface tension between water and oil, allowing dirt and sebum to be rinsed away. Because it is amphoteric (can act as either an acid or a base), it remains gentle on the skin's natural barrier while still providing effective cleansing and foam.
Is Sodium Stearoamphohydroxypropylsulfonate safe for most people?
Sodium Stearoamphohydroxypropylsulfonate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Sodium Stearoamphohydroxypropylsulfonate?
Individuals who strictly avoid all synthetic 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.