Ingredient review
Myristamidopropyl Hydroxysultaine
INCI: MYRISTAMIDOPROPYL HYDROXYSULTAINE
A gentle, effective surfactant that cleanses without stripping the skin, making it a popular choice for sensitive skin formulas.
In plain English
This ingredient is a mild cleansing agent that helps create a rich lather in products like face washes and shampoos. It is designed to remove dirt and oil without being harsh or drying, which is why it is often found in products for sensitive or dry skin. Think of it as a gentle soap that cleans effectively but leaves your skin feeling comfortable, not tight or irritated.
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
Myristamidopropyl Hydroxysultaine 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 Myristamidopropyl Hydroxysultaine.
- 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
Myristamidopropyl Hydroxysultaine is a synthetic amphoteric surfactant derived from myristic acid (a fatty acid found in coconut oil) and modified with a sultaine group. It is part of the betaine family of surfactants, known for their mildness and compatibility with other cleansing ingredients.
How it works
In a cosmetic product, this ingredient works by reducing the surface tension between water and oil, allowing dirt, sebum, and makeup to be rinsed away. Its amphoteric nature means it can adjust its charge based on the pH of the formula, making it stable and gentle. It also boosts foam and improves the texture of cleansers, creating a creamy, luxurious lather.
Pros
Very gentle on skin
Unlike harsh sulfates, this surfactant cleanses without stripping the skin's natural moisture barrier, making it ideal for daily use on sensitive or dry skin.
Excellent foam quality
It produces a rich, creamy lather that feels luxurious and helps spread the product evenly, enhancing the user experience in cleansers and shampoos.
Cons and cautions
Synthetic origin
Although derived from natural fatty acids, the final ingredient is chemically modified, which may not align with preferences for fully natural or organic skincare routines.
Potential for mild drying at high levels
In formulas where it is the primary surfactant at high concentrations, it can still cause some dryness, though this is less common when blended with other mild surfactants.
Best for
- People with sensitive or easily irritated skin
- Those looking for a sulfate-free or gentle cleanser
Use caution if
- Individuals who strictly avoid all synthetic ingredients
- Those with known allergies to coconut-derived fatty acids (rare)
Usage tips
Safety summary
Myristamidopropyl Hydroxysultaine is widely regarded as safe for use in cosmetics. It has a low irritation and sensitization potential, supported by safety assessments from industry panels. It is not known to be carcinogenic, mutagenic, or toxic to reproduction at cosmetic use levels.
Research notes
Research on this specific surfactant is limited, but it is closely related to cocamidopropyl betaine, which has been extensively studied. The Cosmetic Ingredient Review (CIR) panel has evaluated similar sultaine surfactants and found them safe for use in rinse-off products. Most evidence comes from safety assessments rather than clinical efficacy studies.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and other major markets. No specific restrictions at typical concentrations.
- Common uses
- Facial cleansers, Body washes, Shampoos, Baby care products
- Environmental note
- Myristamidopropyl Hydroxysultaine is considered readily biodegradable under standard testing conditions, making it a more environmentally friendly choice compared to some traditional surfactants.
Good to know
- This ingredient is often used as a sulfate-free alternative to sodium lauryl sulfate (SLS).
- It is considered biodegradable and generally safe for aquatic life at typical use levels.
Common questions
What is Myristamidopropyl Hydroxysultaine in beauty products?
This ingredient is a mild cleansing agent that helps create a rich lather in products like face washes and shampoos. It is designed to remove dirt and oil without being harsh or drying, which is why it is often found in products for sensitive or dry skin. Think of it as a gentle soap that cleans effectively but leaves your skin feeling comfortable, not tight or irritated.
What does Myristamidopropyl Hydroxysultaine do in a beauty product?
In a cosmetic product, this ingredient works by reducing the surface tension between water and oil, allowing dirt, sebum, and makeup to be rinsed away. Its amphoteric nature means it can adjust its charge based on the pH of the formula, making it stable and gentle. It also boosts foam and improves the texture of cleansers, creating a creamy, luxurious lather.
Is Myristamidopropyl Hydroxysultaine safe for most people?
Myristamidopropyl Hydroxysultaine is widely regarded as safe for use in cosmetics. It has a low irritation and sensitization potential, supported by safety assessments from industry panels. It is not known to be carcinogenic, mutagenic, or toxic to reproduction at cosmetic use levels.
Who should be careful with Myristamidopropyl Hydroxysultaine?
Individuals who strictly avoid all synthetic ingredients Those with known allergies to coconut-derived fatty acids (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.