Ingredient review
PEG-16 Hydrogenated Castor Oil
INCI: PEG-16 Hydrogenated Castor Oil
A gentle emulsifier that helps blend oil and water in formulas, but may be too heavy for very oily or acne-prone skin in high concentrations.
In plain English
PEG-16 Hydrogenated Castor Oil is a lab-modified version of castor oil that has been made water-friendly. It helps mix oil and water ingredients together so they don't separate in your product. It's often used in cleansers and makeup removers to dissolve makeup and dirt without stripping the skin. While generally safe and mild, it can feel a bit heavy for those with very oily or breakout-prone skin if used in large amounts.
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-16 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-16 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 ingredient made by reacting hydrogenated castor oil with ethylene oxide (PEG). The PEG chains make the oil water-soluble, turning it into a versatile emulsifier and solubilizer.
How it works
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. In cleansers, it helps lift and rinse away oil-based impurities and makeup. It also helps dissolve fragrances and essential oils into water-based formulas.
Pros
Gentle cleanser
It effectively removes makeup and sunscreen without stripping the skin's natural moisture barrier, making it suitable for daily use.
Stable emulsions
It helps keep oil and water mixed in creams and lotions, preventing separation and ensuring a consistent texture.
Cons and cautions
Potential heaviness
In high concentrations, it can leave a slightly greasy or heavy feel on the skin, which may not be ideal for oily or acne-prone types.
Manufacturing concerns
As a PEG derivative, there is a small risk of contamination with 1,4-dioxane during production, though reputable manufacturers purify their ingredients to safe levels.
Best for
- People with normal to dry skin looking for a gentle cleanser or makeup remover
- Those who prefer mild, non-stripping surfactants in their routine
Use caution if
- Individuals with very oily or acne-prone skin who may find it too heavy in leave-on products
- Anyone with a known sensitivity to PEG compounds (rare)
Usage tips
Safety summary
PEG-16 Hydrogenated Castor Oil is considered safe for cosmetic use at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It has low irritation and comedogenic risk for most skin types.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed PEG derivatives and concluded they are safe for use in cosmetics when formulated to minimize impurities. Studies show low skin irritation and sensitization potential for PEG-16 Hydrogenated Castor Oil specifically.
Common label clues
- Typical concentration
- 0.5% to 5% in leave-on products; up to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. The Cosmetic Ingredient Review (CIR) panel has deemed PEG derivatives safe when properly purified.
- Common uses
- Cleansers, Makeup removers, Fragrance solubilizer, Creams and lotions
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels. Some eco-conscious brands may avoid PEGs for sustainability reasons.
Good to know
- PEG numbers (like 16) indicate the average number of ethylene oxide units, which affects water solubility and mildness.
- Hydrogenated castor oil is a solid wax, but PEG modification makes it liquid and water-dispersible.
- It is often used to solubilize fragrances and essential oils in water-based products.
Common questions
What is PEG-16 Hydrogenated Castor Oil in beauty products?
PEG-16 Hydrogenated Castor Oil is a lab-modified version of castor oil that has been made water-friendly. It helps mix oil and water ingredients together so they don't separate in your product. It's often used in cleansers and makeup removers to dissolve makeup and dirt without stripping the skin. While generally safe and mild, it can feel a bit heavy for those with very oily or breakout-prone skin if used in large amounts.
What does PEG-16 Hydrogenated Castor Oil do in a beauty product?
It reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. In cleansers, it helps lift and rinse away oil-based impurities and makeup. It also helps dissolve fragrances and essential oils into water-based formulas.
Is PEG-16 Hydrogenated Castor Oil safe for most people?
PEG-16 Hydrogenated Castor Oil is considered safe for cosmetic use at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane during manufacturing, but reputable suppliers purify the ingredient to meet safety standards. It has low irritation and comedogenic risk for most skin types.
Who should be careful with PEG-16 Hydrogenated Castor Oil?
Individuals with very oily or acne-prone skin who may find it too heavy in leave-on products Anyone with a known sensitivity to PEG compounds (rare)
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.