Ingredient review
PEG-15 Stearamide
INCI: PEG-15 Stearamide
A synthetic emulsifier that helps mix water and oil, generally considered safe at low concentrations but may cause sensitivity in some individuals.
In plain English
PEG-15 Stearamide is a man-made ingredient that helps water and oil stay blended together in products like lotions and cleansers. The 'PEG' part means it has been processed with ethylene oxide to make it more water-friendly. It is not a natural ingredient, but it is widely used because it is effective and generally gentle on skin.
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 Stearamide 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 Stearamide.
- 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 Stearamide is a synthetic compound created by reacting stearic acid (a fatty acid) with ethylene oxide. It belongs to a class of ingredients called PEGs (polyethylene glycols) that are used as emulsifiers, thickeners, and surfactants in cosmetics.
How it works
In a cosmetic product, PEG-15 Stearamide sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable, creamy emulsion. This prevents the product from separating into layers and gives it a smooth, uniform texture.
Pros
Effective emulsifier
Helps oil and water mix smoothly, preventing separation and giving products a consistent, pleasant texture.
Low irritation potential
At typical use levels, PEG-15 Stearamide is considered very low risk for skin irritation, making it suitable for most skin types.
Cons and cautions
Potential contamination risk
During manufacturing, PEGs can be contaminated with 1,4-dioxane, a possible carcinogen. Reputable brands purify their ingredients to remove this impurity.
Synthetic origin
It is not a natural ingredient, which may be a drawback for consumers who prefer plant-based or naturally derived alternatives.
Best for
- People using standard lotions and creams
- Those who want a stable, non-separating product
Use caution if
- Individuals with known sensitivity to PEG compounds
- Those seeking 100% natural or organic formulations
Usage tips
Safety summary
PEG-15 Stearamide is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers and brands control for this. Skin irritation is rare.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG stearamides and found them safe as used in cosmetics. Studies show low acute toxicity and minimal skin irritation. No significant human or animal data suggests harm at typical exposure levels.
Common label clues
- Typical concentration
- Typically 0.5% to 5% of the formula
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) at typical concentrations. Manufacturers are expected to ensure low levels of impurities like 1,4-dioxane.
- Common uses
- Cleansers, Lotions, Creams, Conditioners
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels.
Good to know
- PEG-15 Stearamide is often used in rinse-off products like cleansers and shampoos, so contact time with skin is brief.
- The number '15' refers to the average number of ethylene oxide units, which affects how water-loving the molecule is.
Common questions
What is PEG-15 Stearamide in beauty products?
PEG-15 Stearamide is a man-made ingredient that helps water and oil stay blended together in products like lotions and cleansers. The 'PEG' part means it has been processed with ethylene oxide to make it more water-friendly. It is not a natural ingredient, but it is widely used because it is effective and generally gentle on skin.
What does PEG-15 Stearamide do in a beauty product?
In a cosmetic product, PEG-15 Stearamide sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable, creamy emulsion. This prevents the product from separating into layers and gives it a smooth, uniform texture.
Is PEG-15 Stearamide safe for most people?
PEG-15 Stearamide is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers and brands control for this. Skin irritation is rare.
Who should be careful with PEG-15 Stearamide?
Individuals with known sensitivity to PEG compounds Those seeking 100% natural or organic formulations
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.