Ingredient review
PEG-120 Methyl Glucose Triisostearate
INCI: PEG-120 Methyl Glucose Triisostearate
A mild, non-stripping surfactant that cleanses without disrupting the skin barrier.
In plain English
This ingredient is a gentle cleansing agent derived from glucose (a sugar) and fatty acids. It helps create a rich, creamy lather in cleansers while being very mild on the skin. Unlike harsher detergents, it cleans without stripping away your skin's natural moisture barrier, making it a favorite for sensitive or dry skin types.
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
PEG-120 Methyl Glucose Triisostearate 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 PEG-120 Methyl Glucose Triisostearate.
- 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 semi-synthetic polymer made by attaching polyethylene glycol (PEG) chains to methyl glucose triisostearate, which itself comes from glucose and isostearic acid (a fatty acid). It acts as a non-ionic surfactant and thickener.
How it works
In a cleanser, it helps water mix with oil and dirt so they can be rinsed away. Its large molecular structure makes it too big to penetrate the skin deeply, so it stays on the surface and gently lifts impurities without irritating the skin barrier.
Pros
Ultra-gentle cleansing
Does not strip the skin's natural moisture barrier, making it ideal for sensitive, dry, or compromised skin.
Rich, creamy texture
Creates a dense, luxurious lather that feels pleasant and non-drying during use.
Cons and cautions
May be too mild for oily skin
If you have very oily or acne-prone skin, you might feel this doesn't remove excess oil thoroughly enough.
PEG-related purity concerns
Some consumers avoid PEG compounds due to potential contamination with ethylene oxide or 1,4-dioxane, though reputable brands purify their ingredients.
Best for
- People with dry, sensitive, or eczema-prone skin
- Anyone looking for a gentle, non-stripping daily cleanser
Use caution if
- Those who prefer sulfate-free but still want a very deep, foaming clean (may find this too mild)
Usage tips
Safety summary
PEG-120 Methyl Glucose Triisostearate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards.
Research notes
The Cosmetic Ingredient Review (CIR) Expert Panel has reviewed PEG derivatives and found them safe for use in cosmetics when formulated properly. No significant human or animal studies indicate toxicity at cosmetic use levels.
Common label clues
- Typical concentration
- 1–5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (US) and EU CosIng database. The Cosmetic Ingredient Review (CIR) panel has deemed it safe as used.
- Common uses
- Gentle cleansers, Body washes, Shampoos, Facial cleansers
- Environmental note
- PEG compounds can be biodegradable, but their production involves ethylene oxide, which is energy-intensive. Look for brands that verify low impurity levels.
Good to know
- This ingredient is often found in 'cream cleansers' and 'milk cleansers'.
- It is considered biodegradable and generally safe for aquatic life at typical use levels.
Common questions
What is PEG-120 Methyl Glucose Triisostearate in beauty products?
This ingredient is a gentle cleansing agent derived from glucose (a sugar) and fatty acids. It helps create a rich, creamy lather in cleansers while being very mild on the skin. Unlike harsher detergents, it cleans without stripping away your skin's natural moisture barrier, making it a favorite for sensitive or dry skin types.
What does PEG-120 Methyl Glucose Triisostearate do in a beauty product?
In a cleanser, it helps water mix with oil and dirt so they can be rinsed away. Its large molecular structure makes it too big to penetrate the skin deeply, so it stays on the surface and gently lifts impurities without irritating the skin barrier.
Is PEG-120 Methyl Glucose Triisostearate safe for most people?
PEG-120 Methyl Glucose Triisostearate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk. The main concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards.
Who should be careful with PEG-120 Methyl Glucose Triisostearate?
Those who prefer sulfate-free but still want a very deep, foaming clean (may find this too mild)
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.