Ingredient review
PEG-65 Hydrogenated Castor Oil
INCI: PEG-65 HYDROGENATED CASTOR OIL
A gentle emulsifier that helps blend oil and water in cleansers and creams, but may not suit those avoiding ethoxylated ingredients.
In plain English
PEG-65 Hydrogenated Castor Oil is a lab-made ingredient that helps oil and water mix together in products like cleansers and lotions. The 'PEG' part means it has been treated with ethylene oxide to make it water-friendly, while the hydrogenated castor oil part is a solid, waxy version of castor oil. It is often used to dissolve fragrances or essential oils into water-based formulas without separating.
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-65 Hydrogenated 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-65 Hydrogenated 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
A semi-synthetic compound created by reacting hydrogenated castor oil with ethylene oxide, resulting in a water-soluble emulsifier with 65 units of polyethylene glycol (PEG).
How it works
It reduces the surface tension between oil and water, allowing them to form a stable mixture. In cleansers, it helps lift makeup and sebum so they can be rinsed away. In leave-on products, it keeps the formula from separating and can help disperse small amounts of fragrance or active oils evenly.
Pros
Effective emulsifier
Blends oil and water smoothly, making cleansers and creams feel consistent and easy to rinse off.
Low irritation potential
Generally well-tolerated on skin, with low reported irritation in typical use concentrations.
Cons and cautions
Ethoxylation concerns
The manufacturing process can produce trace amounts of 1,4-dioxane, a potential contaminant that some consumers prefer to avoid.
Not biodegradable
As a PEG derivative, it is not readily biodegradable and may persist in the environment longer than natural alternatives.
Best for
- People who use rinse-off cleansers and makeup removers
- Those looking for stable, non-separating emulsions
Use caution if
- Individuals who prefer to avoid PEGs or ethoxylated ingredients
- Those with very sensitive or reactive skin who may react to trace impurities
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations, though trace impurities from ethoxylation may be a concern for some. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have reviewed PEG derivatives and found them safe when formulated properly.
Research notes
Limited direct studies on PEG-65 Hydrogenated Castor Oil specifically, but broader research on PEG compounds indicates low acute toxicity and skin irritation. The main safety discussion centers on potential 1,4-dioxane contamination, which is regulated in many regions.
Common label clues
- Typical concentration
- 0.5% to 5% in rinse-off products; lower in leave-on formulations
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with concentration limits typically under 5% in leave-on products.
- Common uses
- Cleansers, Makeup removers, Fragrance solubilizer, Emulsions
- Environmental note
- PEG compounds are not readily biodegradable; however, hydrogenated castor oil is derived from castor beans, a renewable resource.
Good to know
- PEG-65 Hydrogenated Castor Oil is often used to solubilize essential oils and fragrances in water-based toners and serums.
- The number '65' refers to the average number of ethylene oxide units, which affects its water solubility and emulsifying strength.
Common questions
What is PEG-65 Hydrogenated Castor Oil in beauty products?
PEG-65 Hydrogenated Castor Oil is a lab-made ingredient that helps oil and water mix together in products like cleansers and lotions. The 'PEG' part means it has been treated with ethylene oxide to make it water-friendly, while the hydrogenated castor oil part is a solid, waxy version of castor oil. It is often used to dissolve fragrances or essential oils into water-based formulas without separating.
What does PEG-65 Hydrogenated Castor Oil do in a beauty product?
It reduces the surface tension between oil and water, allowing them to form a stable mixture. In cleansers, it helps lift makeup and sebum so they can be rinsed away. In leave-on products, it keeps the formula from separating and can help disperse small amounts of fragrance or active oils evenly.
Is PEG-65 Hydrogenated Castor Oil safe for most people?
Considered safe for cosmetic use at typical concentrations, though trace impurities from ethoxylation may be a concern for some. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have reviewed PEG derivatives and found them safe when formulated properly.
Who should be careful with PEG-65 Hydrogenated Castor Oil?
Individuals who prefer to avoid PEGs or ethoxylated ingredients Those with very sensitive or reactive skin who may react to trace impurities
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.