Lanolin: The Wool-Derived Moisturiser That Some Skin Reacts To

Lanolin is a natural emollient from sheep's wool, brilliant for very dry skin but a recognised allergen for some. What it is, who reacts, the names it hides under, and the nursing-parent angle, in plain UK English.

What it is

Lanolin is a soft, waxy substance produced by the glands of wool-bearing animals and collected from sheep’s wool after shearing. It is sometimes called wool wax or wool grease. Chemically it is a mixture of esters, alcohols and fatty acids rather than a single compound, which is part of why different people respond to it in different ways. On an ingredient list it appears under the INCI name Lanolin, or its Latin form Adeps lanae, along with related versions such as Lanolin alcohol and Hydrogenated lanolin.

As a skincare ingredient, lanolin is prized as an emollient and occlusive. Emollient means it softens and smooths the skin. Occlusive means it forms a layer that slows water loss and seals moisture in. That double action is why it turns up in the richest, most protective products, the sort reached for when lighter lotions simply are not enough.

Why it is used

Lanolin is used because it works exceptionally well on very dry, cracked and chapped skin. It has a texture close to the skin’s own natural oils, so it spreads and absorbs in a way that feels comforting, and its occlusive film is genuinely effective at holding water in the skin. For deeply dry lips, sore nipples during breastfeeding, weather-chapped cheeks and rough heels, it can succeed where thinner moisturisers fail.

It is also long-established and inexpensive, so formulators have relied on it for decades. You will find it in lip balms, nipple creams, nappy creams, heavy body ointments, hand salves and some colour cosmetics, where it adds slip and helps other ingredients spread. For the majority of people it does its job quietly and well.

The UK and EU rules

Lanolin is a permitted cosmetic ingredient in the UK and the EU, and there is no ban or restriction on its everyday use in creams and balms. Unlike the named fragrance allergens, it does not have to be flagged with a special warning. It simply appears in the ingredient list under its INCI name like any other ingredient.

Because it is a recognised allergen, lanolin is one of the substances included in the standard series used for dermatology patch testing, so if you are investigated for a suspected skin allergy, lanolin, or more specifically wool alcohols, is likely to be among the substances tested. On products, the practical point is that there is no special symbol to look for. Reading the ingredient list, and knowing lanolin’s alternate names, is what protects you.

Who reacts and why

Most people tolerate lanolin well, and it is important not to overstate the risk. But it is a recognised contact allergen, meaning some people’s immune systems learn to react to it, producing a delayed, itchy dermatitis a day or two after contact, in the area where the product was applied. This is different from simple irritation, and it tends to persist once sensitisation has occurred.

The risk is notably higher in people with a damaged skin barrier. That includes those with eczema, leg ulcers, and chronically inflamed or broken skin, because compromised skin absorbs more and is more prone to becoming sensitised. This is one of medicine’s quiet ironies, since the people most likely to reach for a rich lanolin ointment, those with severe dryness, are also among those most likely to react to it. Lanolin alcohol, a fraction of raw lanolin, is often the more allergenic component, which is why highly purified lanolin is sometimes said to be less troublesome, though it is not risk-free.

A note for nursing parents

Lanolin deserves a specific mention for breastfeeding, because purified lanolin is one of the most common ingredients in nipple creams. If nipple skin becomes sore, cracked or increasingly reactive during breastfeeding, lanolin is one of several things worth considering as a possible contributor, and a fragrance-free, lanolin-free balm may suit better. It is also worth being aware of what is on the skin around feeding times. None of this is a reason to panic, and lanolin nipple creams help many parents. It is simply a known trigger worth keeping in mind. A midwife, health visitor, pharmacist or GP can advise on alternatives.

How to spot it on a label

The main INCI name is Lanolin, but the ingredient hides under several aliases. Watch for Lanolin alcohol, Wool wax, Wool grease, Adeps lanae, Hydrogenated lanolin, Lanolin oil, and trade or derivative names such as Amerchol. Because lanolin alcohol is often the more allergenic fraction, treat any of these as part of the same family if you are avoiding it.

The product categories to check first are lip balms, nipple and nappy creams, heavy moisturisers and ointments, hand and foot salves, and some foundations and colour cosmetics. If a product is marketed for very dry or cracked skin, lanolin is a plausible ingredient, so it is worth turning the pack over.

A balanced take

Lanolin is not something to fear across the board. For a great many people it is one of the most effective moisturising ingredients available, natural, close to the skin’s own oils, and hard to beat for serious dryness. The reasonable position is neither to avoid it on principle nor to assume it must be gentle because it is natural. It is a superb emollient for most and a genuine allergen for a minority, and the only way to know which group you are in is your own experience, or a patch test. If lanolin has never caused you trouble, there is no reason to stop using it. If your dry, eczematous skin flares under rich creams, lanolin is one of the first ingredients worth ruling out.

What to do if avoiding it

If you know or suspect lanolin is a trigger, learn its full list of names and screen for the whole family, including lanolin alcohol and wool wax. Choose products labelled lanolin-free where possible, and for dryness look to alternative occlusives and emollients that your skin tolerates. Patch test any new rich product on a small area first, especially if you have eczema or broken skin. If you keep reacting despite avoiding lanolin, or you are not sure what is causing a persistent dermatitis, a GP or dermatologist can arrange patch testing to confirm your triggers, which takes the guesswork out of label-reading.

Check it against your own list

To check a product, SkinSAFE lets you filter a catalogue to screen out lanolin and other allergens, and a free browser extension like Clearya flags ingredients of concern as you shop online. These rate a product on general criteria rather than against your own list.

Once you know what you are screening for, a personal-list app like ClearaScan lets you save lanolin and its aliases once and scan any product, cosmetic, food or medication, to flag only your triggers. It also keeps a Reaction Journal for flare-ups, a shared Care Circle so family or carers can scan for you, and a Trusted Products list for items you have cleared, and it is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)

Written and reviewed by the Sensitive Skin Lab editorial team.