Ingredient review

PEG-55 Hydrogenated Castor Oil

INCI: PEG-55 HYDROGENATED CASTOR OIL

A gentle, effective emulsifier that helps blend oil and water in cleansers and makeup removers, with a low risk of irritation.

beautyskincaresurfactantemulsifier

In plain English

PEG-55 Hydrogenated Castor Oil is a modified version of castor oil that has been treated with hydrogen and polyethylene glycol to make it water-friendly. In skincare, it acts as a helper ingredient that allows oil and water to mix together, which is why it's often found in cleansers and makeup removers. It helps lift away dirt, oil, and makeup without leaving a heavy residue, and it's generally considered very gentle on the skin.

Review score

Safety, usefulness, and evidence

4.0Good

4.0/ 5

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

How reviews are scored

Quick decision guide

Useful, but context matters

PEG-55 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-55 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There 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 polyethylene glycol (PEG). This process creates a water-soluble emulsifier that can stabilize mixtures of oil and water in cosmetic formulas.

How it works

It works by reducing the surface tension between oil and water, allowing them to blend into a stable emulsion. In a cleanser, it helps break down and lift away oily impurities, makeup, and sunscreen from the skin's surface, which can then be rinsed away with water.

Pros

Gentle cleanser

It effectively removes makeup and excess oil without stripping the skin's natural moisture barrier, making it suitable for daily use.

Low irritation risk

Clinical and consumer reports indicate a low likelihood of causing redness, stinging, or irritation, even on sensitive skin types.

Cons and cautions

PEG concerns

Some consumers prefer to avoid PEG compounds due to potential contamination with 1,4-dioxane during manufacturing, though reputable brands ensure purity.

Not for all preferences

If you follow a 'PEG-free' or minimal-ingredient routine, this ingredient may not align with your personal preferences.

Best for

People looking for a gentle, effective makeup remover or facial cleanser
Those with normal to combination skin who want a non-stripping cleanser

Use caution if

Individuals with known sensitivity to PEG compounds or castor oil derivatives
Those following a strict 'PEG-free' skincare routine

Usage tips

Use in a cleanser or makeup remover as part of your evening routine to thoroughly remove sunscreen and makeup.

Follow with a water-based cleanser if you prefer a double-cleansing method, though this ingredient often rinses clean on its own.

Safety summary

PEG-55 Hydrogenated Castor Oil is considered safe for use in cosmetics at typical concentrations. The main safety consideration is potential contamination with 1,4-dioxane, a byproduct of PEG manufacturing, but reputable suppliers and brands control this to trace levels. It has a low irritation and comedogenic risk.

Research notes

Research on PEG-55 Hydrogenated Castor Oil is limited, but it is structurally similar to other PEG castor oil derivatives that have been evaluated for safety. The Cosmetic Ingredient Review (CIR) panel has assessed related PEG compounds and found them safe for use in cosmetics when formulated appropriately.

Common label clues

Typical concentration: 1% to 10% in rinse-off products; lower in leave-on formulas
Regulatory status: Approved for use in cosmetics by the FDA (as part of generally recognized ingredients) and by the European Commission under the EU Cosmetics Regulation. Manufacturers must ensure low levels of 1,4-dioxane impurity.
Common uses: Cleansers, Makeup removers, Shampoos, Body washes, Facial washes
Environmental note: PEG compounds are generally biodegradable, but their production involves petrochemical processing. Some consumers prefer plant-based alternatives for environmental reasons.

Good to know

PEG-55 Hydrogenated Castor Oil is often used in combination with other surfactants to create a balanced cleansing experience.
It is considered safe for use in cosmetics by major regulatory bodies when formulated within recommended concentration limits.

Common questions

What is PEG-55 Hydrogenated Castor Oil in beauty products?

What does PEG-55 Hydrogenated Castor Oil do in a beauty product?

Is PEG-55 Hydrogenated Castor Oil safe for most people?

Who should be careful with PEG-55 Hydrogenated Castor Oil?

Individuals with known sensitivity to PEG compounds or castor oil derivatives Those following a strict 'PEG-free' skincare routine

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of PEG CompoundsOpen European Commission - CosIng DatabaseOpen PubMed - Safety of PEG derivatives in cosmeticsOpen

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.