Ingredient review
Sodium Hexeth-4 Carboxylate
INCI: SODIUM HEXETH-4 CARBOXYLATE
A gentle synthetic surfactant that cleanses effectively while being less harsh than traditional sulfates.
In plain English
Sodium Hexeth-4 Carboxylate is a man-made cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's often used in 'gentle' or 'sulfate-free' cleansers because it cleans without making your skin feel tight or dry.
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 Hexeth-4 Carboxylate 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 Hexeth-4 Carboxylate.
- 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 ethoxylated hexanol and carboxylic acid, designed to provide mild cleansing properties.
How it works
It lowers the surface tension between water and oil, allowing impurities and excess sebum to be emulsified and washed away. Its carboxylate group gives it a gentle, non-stripping character compared to harsher anionic surfactants.
Pros
Gentle on skin
This surfactant is much milder than sodium lauryl sulfate, making it a good choice for daily cleansing without stripping natural oils.
Low irritation risk
Clinical and anecdotal evidence suggests it rarely causes stinging or redness, even for those with reactive skin.
Cons and cautions
Less foaming
It produces a lower, creamier lather compared to traditional sulfates, which some users may find less satisfying.
Potential for dryness at high levels
If used as the sole surfactant at high concentrations, it can still be slightly drying, so it's often blended with other mild agents.
Best for
- People with dry or sensitive skin
- Those looking for a sulfate-free cleanser
Use caution if
- Individuals with known allergies to ethoxylated compounds (rare)
Usage tips
Safety summary
Sodium Hexeth-4 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research on this specific ingredient is limited, but it belongs to a well-studied class of mild surfactants. Studies on similar carboxylate surfactants confirm low irritation and good cleansing efficacy. More independent studies would strengthen the evidence base.
Common label clues
- Typical concentration
- Typically 1–10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Facial cleansers, Body washes, Shampoos, Makeup removers
- Environmental note
- As a synthetic ethoxylate, it may have moderate biodegradability. Always check product-level environmental claims.
Good to know
- This ingredient is often found in 'sulfate-free' and 'gentle' cleansers.
- It is compatible with a wide pH range, typically 5.5–7.0.
Common questions
What is Sodium Hexeth-4 Carboxylate in beauty products?
Sodium Hexeth-4 Carboxylate is a man-made cleansing ingredient that helps water mix with oil and dirt so they can be rinsed away. It's often used in 'gentle' or 'sulfate-free' cleansers because it cleans without making your skin feel tight or dry.
What does Sodium Hexeth-4 Carboxylate do in a beauty product?
It lowers the surface tension between water and oil, allowing impurities and excess sebum to be emulsified and washed away. Its carboxylate group gives it a gentle, non-stripping character compared to harsher anionic surfactants.
Is Sodium Hexeth-4 Carboxylate safe for most people?
Sodium Hexeth-4 Carboxylate is considered safe for use in cosmetics at typical concentrations. It has low skin irritation and sensitization potential, making it suitable for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Sodium Hexeth-4 Carboxylate?
Individuals with known allergies to ethoxylated compounds (rare)
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.