Ingredient review
PEG-30 Hydrogenated Castor Oil Isostearate
INCI: PEG-30 Hydrogenated Castor Oil Isostearate
A reliable emulsifier that helps mix oil and water in cleansers and creams, but may not suit those avoiding PEGs.
In plain English
This ingredient is a modified castor oil that has been processed with PEG (polyethylene glycol) to help it mix oil and water. In a skincare product, it acts like a bridge between ingredients that normally don't blend, such as oils and water. It's commonly found in cleansers and makeup removers to help rinse away dirt and makeup without leaving a greasy residue.
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
PEG-30 Hydrogenated Castor Oil Isostearate 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-30 Hydrogenated Castor Oil Isostearate.
- 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 emulsifier made by reacting hydrogenated castor oil with PEG (polyethylene glycol) and isostearic acid. It belongs to a family of ingredients used to stabilize mixtures of oil and water.
How it works
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture (emulsion). This helps products feel smooth and spread easily, and helps water-based cleansers dissolve and rinse away oily residues.
Pros
Effective emulsifier
Helps oil and water mix smoothly, making cleansers and creams feel light and non-greasy.
Improves rinse-off
Enhances the ability of water to wash away oils and makeup, leaving skin clean without heavy residue.
Cons and cautions
PEG-related concerns
As an ethoxylated ingredient, it may contain trace impurities like 1,4-dioxane, though levels are typically low in well-manufactured products.
Not for PEG-free routines
If you avoid PEGs for personal or environmental reasons, this ingredient is not suitable.
Best for
- People using oil-based cleansers or makeup removers
- Those with normal to oily skin looking for effective cleansing
Use caution if
- Individuals who prefer to avoid PEGs or ethoxylated ingredients due to personal or environmental concerns
Usage tips
Safety summary
Generally considered safe at typical use levels. The main concern is potential trace impurities from the ethoxylation process, but reputable manufacturers control these to low levels. The Cosmetic Ingredient Review (CIR) panel has reviewed similar PEG compounds and found them safe as used.
Research notes
Limited direct studies on this specific compound, but the broader class of PEGylated castor oil derivatives is well-studied for safety and efficacy as emulsifiers. The CIR panel has reviewed related ingredients and deemed them safe in cosmetics.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The EU restricts levels of 1,4-dioxane impurity in cosmetic ingredients.
- Common uses
- Cleansers, Makeup removers, Lotions, Creams
- Environmental note
- PEG-based ingredients can be slow to biodegrade. Some manufacturers are moving toward biodegradable alternatives.
Good to know
- Hydrogenated castor oil is a solid wax derived from castor oil, modified to be more stable.
- PEG-30 indicates the average number of ethylene oxide units in the PEG chain.
Common questions
What is PEG-30 Hydrogenated Castor Oil Isostearate in beauty products?
This ingredient is a modified castor oil that has been processed with PEG (polyethylene glycol) to help it mix oil and water. In a skincare product, it acts like a bridge between ingredients that normally don't blend, such as oils and water. It's commonly found in cleansers and makeup removers to help rinse away dirt and makeup without leaving a greasy residue.
What does PEG-30 Hydrogenated Castor Oil Isostearate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to form a stable, uniform mixture (emulsion). This helps products feel smooth and spread easily, and helps water-based cleansers dissolve and rinse away oily residues.
Is PEG-30 Hydrogenated Castor Oil Isostearate safe for most people?
Generally considered safe at typical use levels. The main concern is potential trace impurities from the ethoxylation process, but reputable manufacturers control these to low levels. The Cosmetic Ingredient Review (CIR) panel has reviewed similar PEG compounds and found them safe as used.
Who should be careful with PEG-30 Hydrogenated Castor Oil Isostearate?
Individuals who prefer to avoid PEGs or ethoxylated ingredients due to personal or environmental concerns
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.