Ingredient review

PEG-35 Lanolin

INCI: PEG-35 Lanolin

A gentle, water-friendly lanolin derivative that moisturizes and helps blend oil and water in formulas, but may not suit those with wool allergies.

beautyskincareemollientemulsifier

In plain English

PEG-35 Lanolin is a modified version of lanolin (the natural oil from sheep's wool) that has been treated with polyethylene glycol (PEG) to make it dissolve in water. This means it can moisturize and soften skin without leaving a greasy feel, and it helps other ingredients mix together smoothly. It's often used in creams, lotions, and cleansers.

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-35 Lanolin 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-35 Lanolin.
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-35 Lanolin is a semi-synthetic ingredient created by reacting natural lanolin with ethylene oxide (PEG). This process makes the waxy lanolin water-soluble while retaining its emollient properties. It appears as a pale yellow to white waxy solid or liquid, depending on the specific grade.

How it works

In a cosmetic product, PEG-35 Lanolin acts as both an emollient (softening and smoothing the skin by filling in gaps between skin cells) and an emulsifier (helping water and oil phases blend into a stable cream or lotion). Its water-solubility allows it to deposit a thin, non-greasy film on the skin that reduces moisture loss.

Pros

Lightweight moisture

Unlike plain lanolin, PEG-35 Lanolin is water-soluble and leaves a non-greasy feel, making it comfortable for daily use on face and body.

Versatile formula helper

It acts as both an emollient and an emulsifier, so it can simplify ingredient lists and improve the texture of creams and lotions.

Cons and cautions

Allergy risk

People with wool or lanolin allergies may react to this ingredient, causing redness, itching, or irritation.

Processing concerns

The PEG process can introduce trace impurities like 1,4-dioxane if not properly purified, though reputable manufacturers use purified grades.

Best for

People with normal to dry skin looking for a lightweight moisturizer
Those who want a gentle emulsifier in their skincare routine

Use caution if

Individuals with known allergies to lanolin or wool products
Those seeking strictly plant-based or vegan ingredients

Usage tips

Use in products formulated for dry or combination skin to add moisture without shine.

If you have sensitive skin, patch test a product containing PEG-35 Lanolin before full use.

Combine with humectants like glycerin for enhanced hydration.

Safety summary

PEG-35 Lanolin is considered safe for most people when used in cosmetics at typical concentrations. The main concern is potential allergy in those sensitive to lanolin. Purified grades minimize impurity risks. Overall, it has a low irritation and comedogenic profile.

Research notes

Studies on PEG lanolin derivatives indicate low skin irritation and sensitization potential. The CIR panel has reviewed similar ingredients and concluded they are safe for cosmetic use. No recent high-quality human trials specifically on PEG-35 Lanolin were found, but the ingredient class is well-established.

Common label clues

Typical concentration: 1–10% in leave-on products; up to 20% in rinse-off products
Regulatory status: Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated PEG lanolin derivatives and found them safe for use in cosmetics when formulated properly.
Common uses: Moisturizers, Cleansers, Hair conditioners, Body lotions, Makeup removers
Environmental note: Lanolin is a byproduct of wool production, making it a renewable resource. However, the PEG process involves synthetic chemistry, and the ingredient may not be biodegradable in all environments.

Good to know

PEG-35 Lanolin is often listed simply as 'PEG-35 Lanolin' on labels; it is not the same as plain lanolin or lanolin alcohol.
The number '35' refers to the average number of ethylene oxide units added, which determines its water solubility.

Common questions

What is PEG-35 Lanolin in beauty products?

What does PEG-35 Lanolin do in a beauty product?

Is PEG-35 Lanolin safe for most people?

Who should be careful with PEG-35 Lanolin?

Individuals with known allergies to lanolin or wool products Those seeking strictly plant-based or vegan ingredients

Research sources

Cosmetic Ingredient Review (CIR) – Safety Assessment of PEG Lanolin DerivativesOpen PubMed – Lanolin allergy reviewOpen European Chemicals Agency (ECHA) – PEG-35 LanolinOpen

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.