Ingredient review
PEG-30 Hydrogenated Castor Oil Triisostearate
INCI: PEG-30 HYDROGENATED CASTOR OIL TRIISOSTEARATE
A reliable emulsifier that helps mix oil and water in your products, but may be slightly pore-clogging for acne-prone skin.
In plain English
This ingredient is a helper that allows oil and water to blend together smoothly in creams, lotions, and cleansers. It is made by attaching polyethylene glycol (PEG) chains to hydrogenated castor oil, then adding triisostearate groups. In simple terms, it keeps your product from separating and helps it spread evenly on your 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.
Main practical flags: irritation is low; clogging risk is moderate.
- Source
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- moderate
Quick decision guide
Useful, but context matters
PEG-30 Hydrogenated Castor Oil Triisostearate can be useful, but watch for possible clogging concerns.
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 Triisostearate.
- 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
moderateMay be fine for many users but deserves caution if you are breakout-prone.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A semi-synthetic emulsifier created by reacting hydrogenated castor oil with PEG-30 and triisostearic acid. It belongs to the PEG family of compounds, which are widely used in cosmetics to improve texture and stability.
How it works
It reduces the surface tension between oil and water, allowing them to form a stable mixture (emulsion). This means your lotion or cream stays creamy and doesn't separate into watery and oily layers. It also helps other ingredients spread more evenly on your skin.
Pros
Effective emulsifier
Helps create smooth, stable creams and lotions that feel luxurious and don't separate over time.
Versatile in formulas
Works well in both rinse-off products like cleansers and leave-on products like moisturizers.
Cons and cautions
Potential comedogenicity
Some users with acne-prone skin may find it clogs pores, especially in leave-on products at higher concentrations.
PEG-related concerns
PEG compounds can sometimes contain 1,4-dioxane as a byproduct, though reputable manufacturers purify them to safe levels.
Best for
- People using oil-based cleansers or makeup removers
- Those with normal to dry skin looking for stable creams
Use caution if
- Individuals with very oily or acne-prone skin who notice breakouts from emulsifiers
Usage tips
Safety summary
Generally recognized as safe for cosmetic use at typical concentrations. The main concern is potential comedogenicity for acne-prone individuals and trace impurities from PEG manufacturing, which are controlled by quality standards.
Research notes
Limited peer-reviewed studies specifically on this ingredient, but PEG derivatives and hydrogenated castor oil have a long history of safe use in cosmetics. The Cosmetic Ingredient Review (CIR) panel has reviewed similar PEG compounds and found them safe as used.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with no concentration restrictions for topical use.
- Common uses
- Cleansers, Makeup removers, Lotions, Creams
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which has environmental considerations.
Good to know
- This ingredient is often found in 'waterless' or balm cleansers that transform into milky textures when mixed with water.
- It is considered safe by major regulatory bodies when used in typical cosmetic concentrations.
Common questions
What is PEG-30 Hydrogenated Castor Oil Triisostearate in beauty products?
This ingredient is a helper that allows oil and water to blend together smoothly in creams, lotions, and cleansers. It is made by attaching polyethylene glycol (PEG) chains to hydrogenated castor oil, then adding triisostearate groups. In simple terms, it keeps your product from separating and helps it spread evenly on your skin.
What does PEG-30 Hydrogenated Castor Oil Triisostearate do in a beauty product?
It reduces the surface tension between oil and water, allowing them to form a stable mixture (emulsion). This means your lotion or cream stays creamy and doesn't separate into watery and oily layers. It also helps other ingredients spread more evenly on your skin.
Is PEG-30 Hydrogenated Castor Oil Triisostearate safe for most people?
Generally recognized as safe for cosmetic use at typical concentrations. The main concern is potential comedogenicity for acne-prone individuals and trace impurities from PEG manufacturing, which are controlled by quality standards.
Who should be careful with PEG-30 Hydrogenated Castor Oil Triisostearate?
Individuals with very oily or acne-prone skin who notice breakouts from emulsifiers
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.