Ingredient review

PEG-9 Ricinoleate

INCI: PEG-9 Ricinoleate

PEG-9 Ricinoleate is a mild emulsifier that helps mix water and oil in cleansers and creams, but its PEG component raises minor purity concerns for some users.

beautyskincaresurfactant

In plain English

PEG-9 Ricinoleate is a helper ingredient that allows water and oil to blend together smoothly in products like face washes and lotions. It is made by attaching a chain of polyethylene glycol (PEG) to ricinoleic acid, a fatty acid from castor oil. This gives it both water-loving and oil-loving properties, so it can stabilize formulas and help rinse away dirt and makeup. While generally considered safe, the PEG part can sometimes be contaminated with impurities like ethylene oxide during manufacturing, which is why some people prefer PEG-free alternatives.

Review score

Safety, usefulness, and evidence

3.8Good

3.8/ 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-9 Ricinoleate 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-9 Ricinoleate.
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

PEG-9 Ricinoleate is a semi-synthetic compound created by reacting 9 units of polyethylene glycol with ricinoleic acid, a fatty acid derived from castor oil. It functions as a non-ionic surfactant and emulsifier.

How it works

In a cosmetic product, PEG-9 Ricinoleate sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable emulsion. It also helps lift dirt and oil from the skin or hair, making it easier to rinse away with water.

Pros

Effective emulsifier

Helps water and oil blend into a smooth, stable cream or lotion, improving product texture and performance.

Mild surfactant

Provides gentle cleansing without stripping the skin's natural moisture barrier, making it suitable for daily use.

Cons and cautions

PEG purity concerns

The manufacturing process can leave trace impurities like ethylene oxide or 1,4-dioxane, which are potential irritants, though levels are regulated.

Not fully biodegradable

PEG compounds can persist in the environment longer than some natural alternatives, raising eco-friendliness questions.

Best for

People looking for gentle cleansers and shampoos
Those with normal to oily skin who want effective but mild cleansing

Use caution if

Individuals who strictly avoid PEGs or ethoxylated ingredients due to purity concerns

Usage tips

Use in rinse-off products like cleansers and shampoos for best results; leave-on products may benefit from lower concentrations.

Pair with other mild surfactants to reduce potential irritation in sensitive skin formulas.

Safety summary

PEG-9 Ricinoleate is considered safe in cosmetic formulations at typical use levels. The main concern is potential contamination with ethylene oxide or 1,4-dioxane, but reputable manufacturers purify their ingredients to meet safety standards. Regulatory bodies like the FDA and EU CosIng allow its use with no specific restrictions beyond general purity requirements.

Research notes

Research on PEG-9 Ricinoleate specifically is limited, but the broader class of PEG ricinoleates is well-studied as mild emulsifiers. The Cosmetic Ingredient Review (CIR) panel has evaluated similar PEG compounds and found them safe when formulated to minimize impurities. No significant skin sensitization or irritation has been reported in patch tests at typical concentrations.

Common label clues

Typical concentration: 0.5% to 5%
Regulatory status: Approved for use in cosmetics by the FDA and EU CosIng database, with concentration limits typically set by good manufacturing practices to minimize impurities.
Common uses: Cleansers, Shampoos, Conditioners, Body washes, Emulsions
Environmental note: PEG compounds are not readily biodegradable in all environments, though they are less persistent than some other synthetic surfactants.

Good to know

PEG-9 Ricinoleate is often found in sulfate-free cleansers as a gentle alternative to harsher surfactants.
The number '9' refers to the average length of the PEG chain, which influences its water solubility and mildness.

Common questions

What is PEG-9 Ricinoleate in beauty products?

What does PEG-9 Ricinoleate do in a beauty product?

Is PEG-9 Ricinoleate safe for most people?

Who should be careful with PEG-9 Ricinoleate?

Individuals who strictly avoid PEGs or ethoxylated ingredients due to purity concerns

Research sources

Cosmetic Ingredient Review (CIR) - Safety of PEGsOpen EU CosIng Database - PEG-9 RicinoleateOpen 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.