Ingredient review
Propylene Glycol Hydroxystearate
INCI: Propylene Glycol Hydroxystearate
A gentle emollient and emulsifier that helps products feel smooth and spread easily, with a low risk of irritation or clogged pores.
In plain English
Propylene Glycol Hydroxystearate is a synthetic ingredient made by combining propylene glycol with hydroxystearic acid (a fatty acid derived from castor oil). In skincare, it acts as an emollient, meaning it softens and smooths the skin, and as an emulsifier, helping oil and water mix together in creams and lotions. It gives products a nice, silky feel and is generally well-tolerated, even by sensitive 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
Propylene Glycol 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 Propylene Glycol 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 synthetic ester formed from propylene glycol and hydroxystearic acid, used primarily as an emollient and emulsifier in cosmetic formulations.
How it works
It sits on the skin's surface to reduce water loss and improve texture, while also helping to blend oil and water phases in a product for a stable, uniform consistency.
Pros
Gentle on skin
Has a low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin types.
Improves product feel
Creates a smooth, non-greasy texture that helps creams and lotions spread easily and absorb well.
Cons and cautions
Synthetic origin
Derived from petrochemicals, which may be a concern for those seeking exclusively natural or plant-based ingredients.
Limited active benefits
Primarily a texture enhancer and stabilizer, it does not provide active skincare benefits like hydration or anti-aging.
Best for
- People with normal to dry skin looking for a gentle emollient
- Those who prefer low-comedogenic ingredients in moisturizers and makeup
Use caution if
- Individuals strictly avoiding all synthetic ingredients
Usage tips
Safety summary
Propylene Glycol Hydroxystearate 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 or dermatological research.
Research notes
Research on this specific ester is limited, but it is structurally similar to other safe fatty acid esters used in cosmetics. Its safety is supported by its widespread use and low reported adverse effects.
Common label clues
- Typical concentration
- Typically 1–5% in leave-on products
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with no known restrictions at typical concentrations.
- Common uses
- Moisturizers, Creams, Lotions, Makeup, Sunscreens
- Environmental note
- As a synthetic ingredient, its production relies on petrochemicals, but it is not known to be bioaccumulative or toxic to aquatic life at cosmetic use levels.
Good to know
- Propylene Glycol Hydroxystearate is different from plain propylene glycol, which can be more irritating for some people.
- It is often used in 'oil-free' formulations because it provides emollience without a heavy, greasy feel.
Common questions
What is Propylene Glycol Hydroxystearate in beauty products?
Propylene Glycol Hydroxystearate is a synthetic ingredient made by combining propylene glycol with hydroxystearic acid (a fatty acid derived from castor oil). In skincare, it acts as an emollient, meaning it softens and smooths the skin, and as an emulsifier, helping oil and water mix together in creams and lotions. It gives products a nice, silky feel and is generally well-tolerated, even by sensitive skin.
What does Propylene Glycol Hydroxystearate do in a beauty product?
It sits on the skin's surface to reduce water loss and improve texture, while also helping to blend oil and water phases in a product for a stable, uniform consistency.
Is Propylene Glycol Hydroxystearate safe for most people?
Propylene Glycol Hydroxystearate 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 or dermatological research.
Who should be careful with Propylene Glycol Hydroxystearate?
Individuals strictly avoiding all synthetic 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.