Ingredient review
Sodium Stearoamphoacetate
INCI: Sodium Stearoamphoacetate
A gentle, low-irritation surfactant that helps cleanse skin and hair without stripping natural moisture.
In plain English
Sodium Stearoamphoacetate is a mild cleansing ingredient often found in 'gentle' or 'sensitive skin' washes. It belongs to a class of surfactants called amphoteric, meaning it can work well in both acidic and alkaline formulas. Unlike harsher sulfates, it cleans without leaving skin feeling tight or dry, making it a popular choice for baby shampoos and face washes 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
Sodium Stearoamphoacetate 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 Stearoamphoacetate.
- 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 derived from stearic acid (a fatty acid found in vegetable oils) and amino acid-like compounds. It is an amphoteric surfactant, meaning it has both positive and negative charges, which allows it to be mild and compatible with other ingredients.
How it works
It reduces the surface tension of water, helping to lift dirt, oil, and makeup from the skin so they can be rinsed away. Its amphoteric nature makes it less irritating than anionic surfactants like sodium lauryl sulfate, and it also helps stabilize foam in cleansing formulas.
Pros
Very gentle on skin
Its amphoteric nature means it cleans without disrupting the skin barrier, making it ideal for sensitive or reactive skin types.
Low irritation for eyes
Commonly used in tear-free baby shampoos because it stings less than many other surfactants.
Cons and cautions
Not a heavy-duty cleanser
If you wear long-wearing or waterproof makeup, you may need an oil-based pre-cleanse because this surfactant alone may not remove everything.
Can feel slightly drying over time
While mild, frequent use in very dry or eczema-prone skin might still cause some tightness if the formula lacks moisturizing ingredients.
Best for
- People with sensitive or easily irritated skin looking for a gentle cleanser
- Those who prefer sulfate-free or low-foam cleansing products
- Parents seeking mild baby washes or shampoos
Use caution if
- Individuals who need a very strong cleanser for heavy oil or waterproof makeup removal (may need a double-cleanse routine)
Usage tips
Safety summary
Sodium Stearoamphoacetate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and sensitization potential, making it suitable for sensitive skin and baby products. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research on amphoteric surfactants like Sodium Stearoamphoacetate shows they are significantly milder than anionic surfactants. Studies indicate they cause less disruption to the skin barrier and lower levels of irritation, though individual responses can vary.
Common label clues
- Typical concentration
- Typically 1–10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. Generally recognized as safe when used as directed.
- Common uses
- Facial cleansers, Body washes, Shampoos, Baby care products
- Environmental note
- This surfactant is biodegradable and has a lower aquatic toxicity profile compared to some traditional anionic surfactants.
Good to know
- Sodium Stearoamphoacetate is often combined with other mild surfactants like cocamidopropyl betaine to improve foam and cleansing power.
- It is biodegradable and considered environmentally friendlier than some harsher surfactants.
Common questions
What is Sodium Stearoamphoacetate in beauty products?
Sodium Stearoamphoacetate is a mild cleansing ingredient often found in 'gentle' or 'sensitive skin' washes. It belongs to a class of surfactants called amphoteric, meaning it can work well in both acidic and alkaline formulas. Unlike harsher sulfates, it cleans without leaving skin feeling tight or dry, making it a popular choice for baby shampoos and face washes for sensitive skin.
What does Sodium Stearoamphoacetate do in a beauty product?
It reduces the surface tension of water, helping to lift dirt, oil, and makeup from the skin so they can be rinsed away. Its amphoteric nature makes it less irritating than anionic surfactants like sodium lauryl sulfate, and it also helps stabilize foam in cleansing formulas.
Is Sodium Stearoamphoacetate safe for most people?
Sodium Stearoamphoacetate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and sensitization potential, making it suitable for sensitive skin and baby products. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Sodium Stearoamphoacetate?
Individuals who need a very strong cleanser for heavy oil or waterproof makeup removal (may need a double-cleanse 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.