Ingredient review
PEG-120 Distearate
INCI: PEG-120 Distearate
A safe, widely used thickener that gives cleansers and lotions a rich, creamy texture without clogging pores or irritating skin.
In plain English
PEG-120 Distearate is a synthetic ingredient that helps make skincare products thicker and creamier. It is often used in cleansers and lotions to give them a luxurious, smooth feel. Think of it as a gentle helper that improves the texture of your product without causing irritation or breakouts. It is made by combining polyethylene glycol (PEG) with stearic acid, a fatty acid found naturally in shea butter and cocoa butter.
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
PEG-120 Distearate 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 Distearate.
- 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
PEG-120 Distearate is a synthetic polymer derived from ethylene oxide and stearic acid. It belongs to a class of ingredients called PEGs (polyethylene glycols), which are widely used in cosmetics as thickeners, emulsifiers, and surfactants. The number 120 refers to the average number of ethylene oxide units in the molecule, which determines its properties.
How it works
When added to water-based formulas, PEG-120 Distearate molecules arrange themselves into a network that traps water, increasing the product's viscosity (thickness). This gives cleansers and lotions a rich, creamy texture that feels pleasant on the skin. It also helps stabilize the formula, preventing separation of ingredients over time.
Pros
Gentle on skin
PEG-120 Distearate has a very low irritation risk, making it suitable for sensitive skin types and daily use.
Non-comedogenic
It does not clog pores, so it is safe for acne-prone skin and will not contribute to breakouts.
Cons and cautions
Synthetic origin
As a synthetic ingredient, it may not appeal to consumers seeking all-natural or organic formulations.
Texture sensitivity
If used in high concentrations, it can make products feel overly thick or sticky, which some users may find unpleasant.
Best for
- Anyone who enjoys a rich, creamy cleanser or lotion
- People with sensitive or acne-prone skin looking for a non-comedogenic thickener
Use caution if
- Those who strictly avoid synthetic or PEG-based ingredients
Usage tips
Safety summary
PEG-120 Distearate is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been raised by regulatory bodies. As with all PEG compounds, purity is important to avoid contamination with 1,4-dioxane, but cosmetic-grade ingredients are rigorously purified.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed PEG compounds and concluded they are safe for use in cosmetics. No specific studies on PEG-120 Distearate alone were found, but its safety profile is consistent with other PEG-based thickeners.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the U.S. FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has reviewed PEG compounds and found them safe for use in cosmetics when formulated properly.
- Common uses
- Cleansers, Shampoos, Body washes, Lotions, Creams
- Environmental note
- PEG-120 Distearate is synthetic and derived from petrochemicals, so it is not biodegradable in the same way as natural thickeners. However, it is used in low concentrations and is not considered a major environmental concern.
Good to know
- PEG-120 Distearate is often used alongside other thickeners like cocamidopropyl betaine to create a balanced, stable formula.
- Despite the 'PEG' prefix, this ingredient is not the same as PEG compounds that have raised concerns about contamination; cosmetic-grade PEGs are purified and considered safe.
Common questions
What is PEG-120 Distearate in beauty products?
PEG-120 Distearate is a synthetic ingredient that helps make skincare products thicker and creamier. It is often used in cleansers and lotions to give them a luxurious, smooth feel. Think of it as a gentle helper that improves the texture of your product without causing irritation or breakouts. It is made by combining polyethylene glycol (PEG) with stearic acid, a fatty acid found naturally in shea butter and cocoa butter.
What does PEG-120 Distearate do in a beauty product?
When added to water-based formulas, PEG-120 Distearate molecules arrange themselves into a network that traps water, increasing the product's viscosity (thickness). This gives cleansers and lotions a rich, creamy texture that feels pleasant on the skin. It also helps stabilize the formula, preventing separation of ingredients over time.
Is PEG-120 Distearate safe for most people?
PEG-120 Distearate is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been raised by regulatory bodies. As with all PEG compounds, purity is important to avoid contamination with 1,4-dioxane, but cosmetic-grade ingredients are rigorously purified.
Who should be careful with PEG-120 Distearate?
Those who strictly avoid synthetic or PEG-based ingredients
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.