Ingredient review
Sodium Myristoyl Isethionate
INCI: Sodium Myristoyl Isethionate
A mild, coconut-derived cleanser that removes impurities without stripping the skin barrier, ideal for sensitive and dry skin types.
In plain English
Sodium Myristoyl Isethionate is a gentle cleansing ingredient made from coconut oil. Unlike harsh soaps that can leave your skin feeling tight and dry, this surfactant lifts away dirt, oil, and makeup while preserving your skin's natural moisture. It's commonly used in creamy cleansers and bar soaps that foam nicely but don't cause irritation.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
Easy yes for most routines
Sodium Myristoyl Isethionate 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 Myristoyl Isethionate.
- 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 mild anionic surfactant produced by reacting myristic acid (from coconut oil) with isethionic acid, then neutralizing with sodium. It belongs to the isethionate family, known for their gentle cleansing properties.
How it works
It reduces the surface tension between water and oil, allowing dirt and sebum to be rinsed away. Its large molecular structure makes it less penetrating into the skin, which minimizes irritation while still providing effective cleansing and a creamy lather.
Pros
Very gentle on skin
Its large molecular structure means it doesn't penetrate deeply into the skin, reducing the risk of irritation and making it suitable for sensitive and eczema-prone skin.
Sulfate-free cleansing
Provides effective foaming and cleansing without using harsh sulfates like SLS, which can strip natural oils and disrupt the skin barrier.
Cons and cautions
Potential for slight dryness
In high concentrations or with very frequent use, it may still cause some dryness, especially for those with extremely dehydrated skin.
Limited to rinse-off products
It is primarily used in wash-off cleansers and soaps, so it won't be found in leave-on creams or serums.
Best for
- People with sensitive or easily irritated skin
- Those seeking a sulfate-free, gentle cleanser
Use caution if
- Individuals who prefer oil-based or cream cleansers without any foaming agents
Usage tips
Safety summary
Sodium Myristoyl Isethionate is considered safe for cosmetic use with a low irritation and comedogenic risk. It is well-tolerated by most skin types, including sensitive skin, and is a preferred alternative to harsher sulfates.
Research notes
Studies and dermatological reviews support its mildness and low irritation potential compared to traditional soaps and SLS. It is widely used in formulations for sensitive skin and has a strong safety record in rinse-off products.
Common label clues
- Typical concentration
- 5–20% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. Generally recognized as safe when used as directed.
- Common uses
- Facial cleansers, Body washes, Shampoos, Bar soaps
- Environmental note
- Derived from renewable coconut oil and is biodegradable, making it a more eco-friendly choice compared to some petroleum-based surfactants.
Good to know
- It is often combined with other mild surfactants to balance foam and feel.
- Commonly found in 'syndet' bars (synthetic detergent bars) that are pH-balanced and less alkaline than traditional soap.
Common questions
What is Sodium Myristoyl Isethionate in beauty products?
Sodium Myristoyl Isethionate is a gentle cleansing ingredient made from coconut oil. Unlike harsh soaps that can leave your skin feeling tight and dry, this surfactant lifts away dirt, oil, and makeup while preserving your skin's natural moisture. It's commonly used in creamy cleansers and bar soaps that foam nicely but don't cause irritation.
What does Sodium Myristoyl Isethionate do in a beauty product?
It reduces the surface tension between water and oil, allowing dirt and sebum to be rinsed away. Its large molecular structure makes it less penetrating into the skin, which minimizes irritation while still providing effective cleansing and a creamy lather.
Is Sodium Myristoyl Isethionate safe for most people?
Sodium Myristoyl Isethionate is considered safe for cosmetic use with a low irritation and comedogenic risk. It is well-tolerated by most skin types, including sensitive skin, and is a preferred alternative to harsher sulfates.
Who should be careful with Sodium Myristoyl Isethionate?
Individuals who prefer oil-based or cream cleansers without any foaming agents
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.