Ingredient review

PEG-5 Lanolin

INCI: PEG-5 Lanolin

PEG-5 Lanolin is a water-friendly version of lanolin that softens skin and helps blend oil and water, but it may clog pores for some people.

beautyskincareemollient

In plain English

PEG-5 Lanolin is a modified form of lanolin, which is a natural oil from sheep's wool. The 'PEG-5' part means it has been treated with ethylene oxide to make it dissolve in water, so it can be used in water-based products like lotions and cleansers. It works as an emollient, meaning it softens and smooths the skin by filling in gaps between skin cells, and as an emulsifier, helping oil and water mix together so the product stays stable. It's generally considered safe and non-irritating, but because it's derived from lanolin, it may cause reactions in people with wool allergies, and it has a moderate chance of clogging pores (comedogenic rating of 3-4 on a 0-5 scale).

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.

Main practical flags: irritation is low; clogging risk is moderate.

Source
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
moderate
How reviews are scored

Quick decision guide

Useful, but context matters

PEG-5 Lanolin can be useful, but watch for possible clogging concerns.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging PEG-5 Lanolin.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

moderate

May be fine for many users but deserves caution if you are breakout-prone.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

PEG-5 Lanolin is a semi-synthetic ingredient made by reacting natural lanolin (a waxy substance from sheep's wool) with 5 units of ethylene oxide. This process creates a water-soluble emollient that retains the moisturizing properties of lanolin but can be easily rinsed off and formulated into clear or milky products.

How it works

In a cosmetic product, PEG-5 Lanolin sits on the skin's surface and forms a thin, protective film that reduces water loss (transepidermal water loss, or TEWL). Its PEG chain allows it to attract and hold water, while the lanolin part provides oil-like slip and softness. As an emulsifier, it helps keep oil and water droplets mixed together, preventing the product from separating.

Pros

Water-soluble emollient

Unlike traditional lanolin, PEG-5 Lanolin rinses off easily with water, making it ideal for cleansers and leave-on products that shouldn't feel heavy.

Improves product stability

As an emulsifier, it helps keep oil and water mixed, so your lotion or cream stays smooth and doesn't separate over time.

Cons and cautions

Potential allergen for sensitive individuals

Because it's derived from lanolin, people with wool allergies may experience redness, itching, or contact dermatitis.

Moderate pore-clogging risk

With a comedogenic rating of 3-4, it may contribute to breakouts in those with oily or acne-prone skin, especially if used in high concentrations.

Best for

  • People with dry or dehydrated skin looking for a non-greasy emollient
  • Those who tolerate lanolin well and want a water-soluble version for easy cleansing

Use caution if

  • Individuals with known allergies to wool, lanolin, or PEG compounds

Usage tips

If you have acne-prone skin, patch test on your jawline for a week before using on your whole face.
Use in a rinse-off product like a cleanser if you're concerned about pore clogging, as it won't stay on the skin long.

Safety summary

PEG-5 Lanolin is considered safe for most people when used as directed. The main concerns are allergic reactions in those sensitive to lanolin and moderate comedogenicity. Regulatory bodies like the CIR have deemed it safe at typical use levels.

Research notes

Studies on PEG lanolin derivatives show they are effective emollients with low acute toxicity and skin irritation. However, individual sensitivity varies, and patch testing is recommended for those with known allergies.

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 in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed PEG lanolin derivatives and found them safe at typical concentrations.
Common uses
Moisturizers, Cleansers, Hair conditioners, Lip balms, Makeup removers
Environmental note
Lanolin is a byproduct of wool production, making it a renewable resource. However, the ethoxylation process involves ethylene oxide, which is produced from fossil fuels and requires energy.

Good to know

  • PEG-5 Lanolin is often listed as 'PEG-5 Lanolin' or 'Ethoxylated Lanolin' on ingredient labels.
  • The number '5' refers to the average number of ethylene oxide units attached, which affects water solubility.

Common questions

What is PEG-5 Lanolin in beauty products?

PEG-5 Lanolin is a modified form of lanolin, which is a natural oil from sheep's wool. The 'PEG-5' part means it has been treated with ethylene oxide to make it dissolve in water, so it can be used in water-based products like lotions and cleansers. It works as an emollient, meaning it softens and smooths the skin by filling in gaps between skin cells, and as an emulsifier, helping oil and water mix together so the product stays stable. It's generally considered safe and non-irritating, but because it's derived from lanolin, it may cause reactions in people with wool allergies, and it has a moderate chance of clogging pores (comedogenic rating of 3-4 on a 0-5 scale).

What does PEG-5 Lanolin do in a beauty product?

In a cosmetic product, PEG-5 Lanolin sits on the skin's surface and forms a thin, protective film that reduces water loss (transepidermal water loss, or TEWL). Its PEG chain allows it to attract and hold water, while the lanolin part provides oil-like slip and softness. As an emulsifier, it helps keep oil and water droplets mixed together, preventing the product from separating.

Is PEG-5 Lanolin safe for most people?

PEG-5 Lanolin is considered safe for most people when used as directed. The main concerns are allergic reactions in those sensitive to lanolin and moderate comedogenicity. Regulatory bodies like the CIR have deemed it safe at typical use levels.

Who should be careful with PEG-5 Lanolin?

Individuals with known allergies to wool, lanolin, or PEG compounds

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of PEG Lanolin DerivativesOpenPersonal Care Products Council - Lanolin and DerivativesOpenPubMed - Contact Allergy to 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.