Ingredient review
Sodium Isostearoamphoacetate
INCI: Sodium Isostearoamphoacetate
A gentle, low-irritation surfactant that effectively cleanses while being kind to sensitive skin.
In plain English
Sodium Isostearoamphoacetate is a mild cleansing ingredient that helps remove dirt, oil, and makeup from your skin without causing dryness or irritation. It belongs to a class of surfactants called amphoacetates, which are known for being gentle and are often used in products for sensitive skin or baby care. Think of it as a soft, effective cleaner that leaves your skin feeling clean but not tight or stripped.
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 Isostearoamphoacetate 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 Isostearoamphoacetate.
- 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 Isostearoamphoacetate is a semi-synthetic surfactant made by reacting isostearic acid (a fatty acid) with amino compounds. It is part of the amphoacetate family, which are known for their mildness and ability to work well with other cleansing ingredients.
How it works
It works by reducing the surface tension of water, allowing it to mix with oils and dirt on your skin. This helps lift impurities away so they can be rinsed off easily. Because it is an amphoteric surfactant, it is less likely to disrupt the skin's natural barrier compared to harsher cleansers like sodium lauryl sulfate.
Pros
Very gentle on skin
Sodium Isostearoamphoacetate has a low irritation risk, making it ideal for sensitive skin types and daily use without causing redness or dryness.
Works well in mild formulas
It pairs nicely with other mild surfactants to create a creamy, non-drying lather that leaves skin feeling soft rather than tight.
Cons and cautions
Limited cleansing power alone
On its own, it may not effectively remove heavy makeup or long-wearing sunscreen, so it is often blended with other cleansers in formulations.
Higher cost
Compared to common surfactants like sodium lauryl sulfate, this ingredient is more expensive, which can increase the price of products containing it.
Best for
- People with sensitive, dry, or eczema-prone skin looking for a gentle cleanser
- Anyone who prefers mild, non-stripping facial or body washes
Use caution if
- Those who need a very strong cleanser for heavy oil or waterproof makeup removal may find it too gentle
Usage tips
Safety summary
Sodium Isostearoamphoacetate is considered safe for use in cosmetics. It has low skin irritation and sensitization potential, and is not known to be comedogenic. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have evaluated similar amphoacetates and found them safe at typical use concentrations.
Research notes
Research on amphoacetate surfactants, including Sodium Isostearoamphoacetate, indicates they are mild and well-tolerated. Studies show they cause less damage to skin barrier function compared to anionic surfactants like SLS. However, specific peer-reviewed studies on this exact compound are limited, with safety data largely extrapolated from related ingredients.
Common label clues
- Typical concentration
- 1% to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. It is 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 many traditional surfactants, making it a more eco-friendly choice.
Good to know
- Sodium Isostearoamphoacetate is often used in baby shampoos and sensitive-skin cleansers because of its mildness.
- It is biodegradable and considered more environmentally friendly than some harsher surfactants.
Common questions
What is Sodium Isostearoamphoacetate in beauty products?
Sodium Isostearoamphoacetate is a mild cleansing ingredient that helps remove dirt, oil, and makeup from your skin without causing dryness or irritation. It belongs to a class of surfactants called amphoacetates, which are known for being gentle and are often used in products for sensitive skin or baby care. Think of it as a soft, effective cleaner that leaves your skin feeling clean but not tight or stripped.
What does Sodium Isostearoamphoacetate do in a beauty product?
It works by reducing the surface tension of water, allowing it to mix with oils and dirt on your skin. This helps lift impurities away so they can be rinsed off easily. Because it is an amphoteric surfactant, it is less likely to disrupt the skin's natural barrier compared to harsher cleansers like sodium lauryl sulfate.
Is Sodium Isostearoamphoacetate safe for most people?
Sodium Isostearoamphoacetate is considered safe for use in cosmetics. It has low skin irritation and sensitization potential, and is not known to be comedogenic. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have evaluated similar amphoacetates and found them safe at typical use concentrations.
Who should be careful with Sodium Isostearoamphoacetate?
Those who need a very strong cleanser for heavy oil or waterproof makeup removal may find it too gentle
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.