Ingredient review
Myristyl Sultaine
INCI: Myristyl Sultaine
A gentle, low-irritation cleansing agent that helps create a rich lather without stripping the skin.
In plain English
Myristyl Sultaine is a mild cleansing ingredient often used in soaps and shampoos. It helps create a nice foam and cleans dirt and oil without being harsh or drying. It belongs to a group of ingredients called amphoteric surfactants, which means they are gentle on skin and eyes, making them popular in baby and sensitive-skin products.
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
Myristyl Sultaine 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 Myristyl Sultaine.
- 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
Myristyl Sultaine is a synthetic surfactant derived from myristyl alcohol, a fatty alcohol. It is a zwitterionic (amphoteric) compound, meaning it can act as either a positive or negative ion depending on the pH, which contributes to its mildness and compatibility with other ingredients.
How it works
In a cosmetic product, Myristyl Sultaine lowers the surface tension between water and oil, allowing dirt and sebum to be rinsed away. It also boosts foam and stabilizes the lather, making cleansers feel more luxurious. Because it is amphoteric, it is less likely to irritate skin compared to stronger anionic surfactants like sodium lauryl sulfate.
Pros
Very gentle on skin
Myristyl Sultaine is one of the mildest surfactants, making it ideal for sensitive skin, baby products, and daily use without causing irritation or redness.
Enhances foam quality
It boosts and stabilizes foam, giving cleansers a creamy, luxurious lather that feels pleasant during use.
Cons and cautions
Synthetic origin
It is manufactured from synthetic fatty alcohols, which may be a drawback for consumers seeking exclusively natural or plant-based ingredients.
Potential for mild dryness
While generally mild, very high concentrations or frequent use can still lead to slight dryness, especially for already dehydrated skin.
Best for
- People with dry or sensitive skin looking for a mild cleanser
- Anyone who prefers gentle, low-foaming cleansers
Use caution if
- Those seeking a completely natural or plant-derived ingredient list
Usage tips
Safety summary
Myristyl Sultaine has a strong safety profile with low irritation and sensitization potential. It is widely used in products for sensitive skin and babies. No significant safety concerns have been raised by regulatory bodies.
Research notes
Research indicates that amphoteric surfactants like Myristyl Sultaine are among the mildest cleansing agents available. Studies show they cause less damage to skin barrier function compared to anionic surfactants. However, most evidence comes from ingredient-level testing rather than large-scale human trials.
Common label clues
- Typical concentration
- 1% to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
- Common uses
- Facial cleansers, Body washes, Shampoos, Baby washes
- Environmental note
- Myristyl Sultaine is generally considered biodegradable, but like all surfactants, it should be used responsibly to minimize environmental impact.
Good to know
- Myristyl Sultaine is often used alongside other surfactants to reduce overall irritation.
- It is considered biodegradable and safe for aquatic environments at typical use levels.
Common questions
What is Myristyl Sultaine in beauty products?
Myristyl Sultaine is a mild cleansing ingredient often used in soaps and shampoos. It helps create a nice foam and cleans dirt and oil without being harsh or drying. It belongs to a group of ingredients called amphoteric surfactants, which means they are gentle on skin and eyes, making them popular in baby and sensitive-skin products.
What does Myristyl Sultaine do in a beauty product?
In a cosmetic product, Myristyl Sultaine lowers the surface tension between water and oil, allowing dirt and sebum to be rinsed away. It also boosts foam and stabilizes the lather, making cleansers feel more luxurious. Because it is amphoteric, it is less likely to irritate skin compared to stronger anionic surfactants like sodium lauryl sulfate.
Is Myristyl Sultaine safe for most people?
Myristyl Sultaine has a strong safety profile with low irritation and sensitization potential. It is widely used in products for sensitive skin and babies. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Myristyl Sultaine?
Those seeking a completely natural or plant-derived 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.