Ingredient review
Hydrogenated Castor Oil Hydroxystearate
INCI: Hydrogenated Castor Oil Hydroxystearate
A gentle, plant-derived ingredient that helps thicken and stabilize formulas without clogging pores.
In plain English
This ingredient is a modified version of castor oil, processed to be more solid and stable. It helps give creams and lipsticks a smooth, thick texture and prevents the oil and water parts of a product from separating. It's very gentle on skin and unlikely to cause breakouts.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Hydrogenated Castor Oil 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 Hydrogenated Castor Oil 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 semi-synthetic wax-like ester derived from castor oil through hydrogenation (adding hydrogen) and esterification (reacting with hydroxystearic acid). It appears as a white to off-white solid.
How it works
In a cosmetic formula, it acts as a thickener and stabilizer. It increases the viscosity of oils and helps keep emulsions (mixtures of oil and water) from separating. It also provides a smooth, non-greasy feel on the skin.
Pros
Gentle on skin
Hydrogenated Castor Oil Hydroxystearate has a very low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin types.
Improves product texture
It gives creams, lotions, and lipsticks a smooth, luxurious feel without being overly greasy or sticky.
Cons and cautions
Not for water-only products
Because it's oil-based, it cannot be used in clear, water-only gels or serums. It's best suited for emulsions and anhydrous formulas.
Potential heaviness at high levels
In very high concentrations, it can make a product feel thick or heavy on the skin, though this is rare in typical formulations.
Best for
- Anyone looking for a gentle thickener in creams or lip products
- People with sensitive or acne-prone skin
Use caution if
- Those who prefer completely water-based, lightweight gel products
Usage tips
Safety summary
Considered very safe for topical use. It has a low irritation potential and is not known to be sensitizing. No significant safety concerns have been reported in cosmetic concentrations.
Research notes
Safety data is based on its similarity to other hydrogenated castor oil derivatives, which have a long history of safe use in cosmetics. Specific studies on this exact ester are limited, but the ingredient class is well-tolerated.
Common label clues
- Typical concentration
- 1-10%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (US) and EU CosIng database. No known restrictions.
- Common uses
- Lipsticks, Creams, Lotions, Makeup
- Environmental note
- Derived from castor oil, a renewable plant source. The hydrogenation process is energy-intensive but the ingredient itself is biodegradable.
Good to know
- It is often used as a vegan alternative to beeswax in lip balms and sticks.
- The hydrogenation process makes it more stable and less likely to go rancid than regular castor oil.
Common questions
What is Hydrogenated Castor Oil Hydroxystearate in beauty products?
This ingredient is a modified version of castor oil, processed to be more solid and stable. It helps give creams and lipsticks a smooth, thick texture and prevents the oil and water parts of a product from separating. It's very gentle on skin and unlikely to cause breakouts.
What does Hydrogenated Castor Oil Hydroxystearate do in a beauty product?
In a cosmetic formula, it acts as a thickener and stabilizer. It increases the viscosity of oils and helps keep emulsions (mixtures of oil and water) from separating. It also provides a smooth, non-greasy feel on the skin.
Is Hydrogenated Castor Oil Hydroxystearate safe for most people?
Considered very safe for topical use. It has a low irritation potential and is not known to be sensitizing. No significant safety concerns have been reported in cosmetic concentrations.
Who should be careful with Hydrogenated Castor Oil Hydroxystearate?
Those who prefer completely water-based, lightweight gel products
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.