Ingredient review
PEG-15 Hydroxystearate
INCI: PEG-15 Hydroxystearate
A reliable emulsifier that helps oil and water mix in your skincare, but it's synthetic and may not suit those avoiding PEGs.
In plain English
PEG-15 Hydroxystearate is a man-made ingredient that helps oil and water stay blended together in products like cleansers and lotions. Think of it as a tiny bridge that keeps the formula from separating into layers. It's made by adding ethylene oxide to a fatty acid derived from castor oil, creating a gentle surfactant that can also help other ingredients spread more evenly on your 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 Hydroxystearate 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 Hydroxystearate.
- 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 polyethylene glycol (PEG) derivative of hydroxystearic acid, produced through ethoxylation. It belongs to a family of emulsifiers widely used in cosmetics to stabilize oil-in-water mixtures.
How it works
Its molecule has both water-loving (hydrophilic) and oil-loving (lipophilic) parts. When added to a formula, it positions itself at the boundary between oil and water droplets, reducing surface tension so they mix into a stable, uniform cream or lotion. This prevents separation and improves texture.
Pros
Effective emulsifier
Helps oil and water blend into a smooth, stable cream or lotion, so your product doesn't separate or feel gritty.
Low irritation potential
Generally considered gentle on skin, making it suitable for daily-use products like cleansers and moisturizers.
Cons and cautions
Synthetic origin
Made through chemical processing, which may be a turn-off if you prefer naturally derived ingredients.
Potential trace impurities
During manufacturing, trace amounts of 1,4-dioxane (a possible contaminant) can form, though reputable brands keep levels well below safety limits.
Best for
- People who use conventional moisturizers, cleansers, or sunscreens
- Those looking for a stable, well-tested emulsifier in their products
Use caution if
- Individuals who strictly avoid PEGs or synthetic ethoxylated ingredients
- Anyone with known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
PEG-15 Hydroxystearate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace 1,4-dioxane, which is tightly regulated. Overall, it has a low irritation and comedogenic risk.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG compounds and found them safe as used in cosmetics. Studies indicate low skin irritation and sensitization potential. No significant human health risks have been identified at current usage levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, subject to purity standards that limit potential contaminants like 1,4-dioxane.
- Common uses
- Cleansers, Moisturizers, Makeup removers, Sunscreens
- Environmental note
- As a synthetic PEG compound, it is not readily biodegradable, but it is used in low concentrations and is not considered a major environmental concern.
Good to know
- PEG-15 Hydroxystearate 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 Hydroxystearate in beauty products?
PEG-15 Hydroxystearate is a man-made ingredient that helps oil and water stay blended together in products like cleansers and lotions. Think of it as a tiny bridge that keeps the formula from separating into layers. It's made by adding ethylene oxide to a fatty acid derived from castor oil, creating a gentle surfactant that can also help other ingredients spread more evenly on your skin.
What does PEG-15 Hydroxystearate do in a beauty product?
Its molecule has both water-loving (hydrophilic) and oil-loving (lipophilic) parts. When added to a formula, it positions itself at the boundary between oil and water droplets, reducing surface tension so they mix into a stable, uniform cream or lotion. This prevents separation and improves texture.
Is PEG-15 Hydroxystearate safe for most people?
PEG-15 Hydroxystearate is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace 1,4-dioxane, which is tightly regulated. Overall, it has a low irritation and comedogenic risk.
Who should be careful with PEG-15 Hydroxystearate?
Individuals who strictly avoid PEGs or synthetic ethoxylated ingredients Anyone with known sensitivity to PEG compounds (rare)
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.