Lanolin on an ingredient list: what DermNet says about allergy and irritation

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Reviewed October 17, 2026

The short answer

Lanolin comes from sheep fleece and is used in moisturizers, lip products, sunscreens and many medicines. DermNet says it can cause allergic contact dermatitis and irritant reactions, that the American Contact Dermatitis Society named it 2023 Allergen of the Year because of rising allergic reactions, and that how common the allergy is remains debated.

What is it?

In DermNet's account, it is a blend of many compounds, mostly heavy esters, plus alcohols, sterols, hydrocarbons and fatty acids, taken from sheep wool, cleaned and refined. It says the free alcohols in it are considered the main triggers of allergy.

Where it turns up

DermNet lists steroid creams, hemorrhoid preparations, medicated shampoos, hand creams, moisturizers, barrier creams, sunscreens, lipsticks, makeup removers, foundations, eye makeup, shaving creams and baby oils, as well as industrial uses.

What DermNet says about reactions

• Patch testing of people with dermatitis gave positive results in 1.7 to 3.3 percent. DermNet says the rate in the general population is estimated to be lower, and calls the true prevalence debated.
• Skin that is broken or already inflamed, such as eczema or leg ulcers, seems more likely to become sensitized.
• An allergic reaction can appear unexpectedly even if the ingredient was tolerated before, and shows up 48 to 72 hours after contact. Signs include redness, itching, swelling or blistering, commonly the face, hands or arms.
• Irritant reactions are more common than allergic ones.

How to read it on a label

DermNet says that once lanolin is identified as the trigger, avoiding it is the main treatment, so check labels. It lists other names: wool alcohols, wool fat, wool wax, wool grease, anhydrous lanolin, lanolin alcohol, adeps lanae anhydrous and amerchol. DermNet also says lanolin varies by source and processing, which makes testing hard. A reaction is confirmed by patch testing, which a doctor arranges.

US cosmetic labels generally list ingredients in descending order of amount, but anything at 1% or less can appear in any order after those above 1%. Its position does not tell you the exact concentration. Judge the whole product, how it feels on your skin, and what changes when you add or drop it.

What not to conclude

This page does not say lanolin is safe or unsafe for you, only that DermNet reports allergy and irritation. It rests on one DermNet page. If a product with it irritates your skin, stop using it and ask a dermatologist.