Ingredient review
PEG-50 Hydrogenated Castor Oil
INCI: PEG-50 HYDROGENATED CASTOR OIL
A gentle emulsifier that helps mix oil and water, commonly used in cleansers and makeup removers, with a low risk of irritation.
In plain English
PEG-50 Hydrogenated Castor Oil is a semi-synthetic ingredient made from castor oil that has been treated with ethylene oxide (PEG) and hydrogenated to make it more stable. It acts like a bridge between oil and water, allowing them to mix together in products like cleansers and creams. This helps create smooth, stable formulas that rinse off easily 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-50 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-50 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
PEG-50 Hydrogenated Castor Oil is a polyethylene glycol (PEG) derivative of hydrogenated castor oil. It is a waxy, water-soluble emulsifier that helps oil and water blend into a uniform product.
How it works
In a cosmetic product, PEG-50 Hydrogenated Castor Oil reduces the surface tension between oil and water, allowing them to form a stable emulsion. This means your cleanser or lotion stays mixed and doesn't separate. It also helps water rinse away oils and dirt from the skin, making it effective in makeup removers.
Pros
Effective emulsifier
It reliably blends oil and water, so your cleanser or lotion stays mixed and works well every time.
Low irritation potential
It is generally well-tolerated and unlikely to cause redness or stinging, even on sensitive skin.
Cons and cautions
Potential manufacturing impurities
PEG ingredients can contain trace amounts of ethylene oxide or 1,4-dioxane if not properly purified, though most reputable brands ensure safety.
May be drying for some
In high concentrations, it can strip the skin's natural oils, which may not be ideal for very dry or eczema-prone skin.
Best for
- People who wear makeup and need a gentle, effective makeup remover
- Those with oily or combination skin looking for a non-greasy cleanser
Use caution if
- Individuals with very dry or compromised skin barriers may prefer a creamier, non-PEG emulsifier
Usage tips
Safety summary
PEG-50 Hydrogenated Castor Oil is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with ethylene oxide or 1,4-dioxane during manufacturing, but reputable suppliers control for this. It has low irritation and comedogenic risk.
Research notes
The Cosmetic Ingredient Review (CIR) panel has evaluated PEG derivatives and found them safe for use in cosmetics when formulated to be non-irritating. Studies show low skin irritation and sensitization potential.
Common label clues
- Typical concentration
- 1-10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database. Manufacturers are expected to follow purity guidelines to minimize impurities.
- Common uses
- Cleansers, Makeup removers, Creams, Lotions
- Environmental note
- PEG compounds are not readily biodegradable, but they are used in low concentrations and are generally considered safe for the environment in rinse-off products.
Good to know
- PEG-50 Hydrogenated Castor Oil is often used in 'oil cleansers' that turn milky when mixed with water.
- The number '50' refers to the average number of ethylene oxide units, affecting water solubility.
Common questions
What is PEG-50 Hydrogenated Castor Oil in beauty products?
PEG-50 Hydrogenated Castor Oil is a semi-synthetic ingredient made from castor oil that has been treated with ethylene oxide (PEG) and hydrogenated to make it more stable. It acts like a bridge between oil and water, allowing them to mix together in products like cleansers and creams. This helps create smooth, stable formulas that rinse off easily without leaving a greasy residue.
What does PEG-50 Hydrogenated Castor Oil do in a beauty product?
In a cosmetic product, PEG-50 Hydrogenated Castor Oil reduces the surface tension between oil and water, allowing them to form a stable emulsion. This means your cleanser or lotion stays mixed and doesn't separate. It also helps water rinse away oils and dirt from the skin, making it effective in makeup removers.
Is PEG-50 Hydrogenated Castor Oil safe for most people?
PEG-50 Hydrogenated Castor Oil is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with ethylene oxide or 1,4-dioxane during manufacturing, but reputable suppliers control for this. It has low irritation and comedogenic risk.
Who should be careful with PEG-50 Hydrogenated Castor Oil?
Individuals with very dry or compromised skin barriers may prefer a creamier, non-PEG emulsifier
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.