Ingredient review
PEG-11 Castor Oil
INCI: PEG-11 Castor Oil
PEG-11 Castor Oil is a gentle emulsifier that helps blend oil and water in cleansers and shampoos, but its PEG component raises mild environmental and purity concerns.
In plain English
PEG-11 Castor Oil is a lab-modified version of castor oil. It's made by adding polyethylene glycol (PEG) chains to castor oil, which makes it water-friendly. In your skincare, it acts like a bridge between oil and water, helping cleansers and shampoos mix properly and rinse away dirt and makeup without leaving a greasy film. It's considered gentle for most skin types, but some people prefer to avoid PEGs due to potential impurities from manufacturing.
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-11 Castor Oil 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-11 Castor Oil.
- 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-11 Castor Oil is a semi-synthetic ingredient created by reacting castor oil with 11 units of ethylene oxide (forming PEG-11). It belongs to the family of PEGylated oils, which are used to improve the water solubility and cleansing ability of natural oils.
How it works
In a cosmetic product, PEG-11 Castor Oil reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. This helps cleansers and shampoos effectively remove sebum, makeup, and dirt while rinsing cleanly. It also helps disperse other ingredients evenly throughout the formula.
Pros
Gentle emulsifier
PEG-11 Castor Oil helps cleansers rinse away oil and makeup without harsh scrubbing, making it suitable for daily use on most skin types.
Improves formula stability
It prevents oil and water from separating in your product, so you get a consistent texture and performance from first use to last.
Cons and cautions
Potential for impurities
During manufacturing, PEGs can form trace amounts of 1,4-dioxane, a possible carcinogen. High-quality brands purify their ingredients to minimize this risk.
Environmental persistence
PEG derivatives are not fully biodegradable, which may be a concern for eco-conscious consumers looking for greener alternatives.
Best for
- People who use oil-based cleansers or makeup removers and want a gentle emulsifier
- Those with normal to oily skin looking for a non-stripping cleanser
Use caution if
- Individuals who strictly avoid all PEG-derived ingredients due to personal or environmental preferences
Usage tips
Safety summary
PEG-11 Castor Oil is considered safe for topical use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers use purification steps to keep levels well below safety limits. It has low irritation and comedogenic potential for most people.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed PEGs and concluded they are safe in cosmetics when formulated to minimize impurities. No specific studies on PEG-11 Castor Oil were found, but its safety profile is consistent with other PEGylated oils.
Common label clues
- Typical concentration
- 1–10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed PEGs safe as used in cosmetics when properly purified.
- Common uses
- Cleansers, Shampoos, Conditioners, Makeup removers
- Environmental note
- PEG compounds are not readily biodegradable, which can contribute to aquatic pollution. Some brands are moving toward more eco-friendly alternatives like plant-based glucosides.
Good to know
- PEG-11 Castor Oil is often listed near the top of ingredient lists in cleansing balms and oil cleansers.
- The number '11' refers to the average number of ethylene oxide units, which affects how water-soluble the ingredient is.
Common questions
What is PEG-11 Castor Oil in beauty products?
PEG-11 Castor Oil is a lab-modified version of castor oil. It's made by adding polyethylene glycol (PEG) chains to castor oil, which makes it water-friendly. In your skincare, it acts like a bridge between oil and water, helping cleansers and shampoos mix properly and rinse away dirt and makeup without leaving a greasy film. It's considered gentle for most skin types, but some people prefer to avoid PEGs due to potential impurities from manufacturing.
What does PEG-11 Castor Oil do in a beauty product?
In a cosmetic product, PEG-11 Castor Oil reduces the surface tension between oil and water, allowing them to blend into a stable emulsion. This helps cleansers and shampoos effectively remove sebum, makeup, and dirt while rinsing cleanly. It also helps disperse other ingredients evenly throughout the formula.
Is PEG-11 Castor Oil safe for most people?
PEG-11 Castor Oil is considered safe for topical use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers use purification steps to keep levels well below safety limits. It has low irritation and comedogenic potential for most people.
Who should be careful with PEG-11 Castor Oil?
Individuals who strictly avoid all PEG-derived ingredients due to personal or environmental preferences
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.