Ingredient review
PEG-15 Stearate
INCI: PEG-15 Stearate
A reliable emulsifier that helps create smooth, stable creams and lotions, but may be too heavy for very oily or acne-prone skin.
In plain English
PEG-15 Stearate is a synthetic ingredient that acts like a bridge between oil and water. In skincare, it helps mix ingredients that normally don't blend, like oil and water, so your lotion or cream stays smooth and doesn't separate. It's a type of polyethylene glycol (PEG) combined with stearic acid, a fatty acid found naturally in shea butter and cocoa butter. While generally safe, some people prefer to avoid PEGs due to concerns about potential impurities from manufacturing.
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-15 Stearate 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-15 Stearate.
- 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-15 Stearate is a polyethylene glycol derivative of stearic acid. It is a white to off-white waxy solid that functions primarily as an emulsifier and surfactant in cosmetic formulations.
How it works
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture. This creates a smooth, creamy texture that spreads easily on the skin and helps deliver both water-soluble and oil-soluble ingredients effectively.
Pros
Effective emulsifier
Helps oil and water mix into a stable, smooth cream or lotion, preventing separation and ensuring consistent texture.
Gentle on skin
Generally well-tolerated with low irritation and comedogenic risk, making it suitable for most skin types in typical concentrations.
Cons and cautions
Manufacturing impurities
As a PEG compound, it may contain trace impurities like ethylene oxide or 1,4-dioxane if not properly purified, which some consumers prefer to avoid.
Heavy feel for oily skin
Can leave a slightly heavy or greasy feel on very oily or acne-prone skin, especially in high concentrations.
Best for
- People who use creams and lotions regularly
- Those with normal to dry skin looking for stable moisturizers
Use caution if
- Individuals with very oily or acne-prone skin who prefer lightweight textures
- Those who choose to avoid PEG compounds for personal reasons
Usage tips
Safety summary
PEG-15 Stearate is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with ethylene oxide or 1,4-dioxane during manufacturing, but reputable brands use purified grades that meet safety standards.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG stearates and found them safe for use in cosmetics when formulated to be non-irritating. Studies show low skin irritation and sensitization potential at typical use levels.
Common label clues
- Typical concentration
- 1–5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with concentration limits typically not specified due to its safe history of use.
- Common uses
- Moisturizers, Cleansers, Lotions, Creams
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels.
Good to know
- PEG-15 Stearate is often used in combination with other emulsifiers to fine-tune texture.
- The number '15' refers to the average number of ethylene oxide units in the molecule.
Common questions
What is PEG-15 Stearate in beauty products?
PEG-15 Stearate is a synthetic ingredient that acts like a bridge between oil and water. In skincare, it helps mix ingredients that normally don't blend, like oil and water, so your lotion or cream stays smooth and doesn't separate. It's a type of polyethylene glycol (PEG) combined with stearic acid, a fatty acid found naturally in shea butter and cocoa butter. While generally safe, some people prefer to avoid PEGs due to concerns about potential impurities from manufacturing.
What does PEG-15 Stearate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture. This creates a smooth, creamy texture that spreads easily on the skin and helps deliver both water-soluble and oil-soluble ingredients effectively.
Is PEG-15 Stearate safe for most people?
PEG-15 Stearate is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with ethylene oxide or 1,4-dioxane during manufacturing, but reputable brands use purified grades that meet safety standards.
Who should be careful with PEG-15 Stearate?
Individuals with very oily or acne-prone skin who prefer lightweight textures Those who choose to avoid PEG compounds for personal reasons
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.