Is wool bedding hypoallergenic?

Short answer

We work from documents and have not tested any products. No source we read calls wool bedding hypoallergenic, and “hypoallergenic” has no legal definition, so the word proves nothing by itself. What the sources do show are three separate issues that people often lump together as “wool allergy”: dust mite allergen in bedding, contact allergy to lanolin, and itch from the fibre. The sources support each to a different degree, and this page keeps them apart.

Dust mites: what the studies report on wool bedding

NIEHS says dust mites live in mattresses, bedding, upholstered furniture, carpets and curtains, feed on shed skin, and can worsen allergies and asthma. Bedding is a habitat whatever it is made of; the question here is whether wool changes the picture. Three PubMed abstracts bear on it.

The Melbourne study (PMID 9058687, 1997) measured Der p 1, the major dust mite allergen, in 107 homes of mite-sensitive children with asthma. Geometric mean concentrations on the surfaces of sheepskin, wool and cotton mattress coverings were 116, 113 and 19 micrograms per gram of fine dust, against 0.4 on impermeable encasements (p < 0.001). The mattresses underneath showed 142, 38, 20 and 0.6 respectively. After the coverings were removed, mattress-surface values at the end of the study were 79, 65, 9.7 and 3.1.

The Wellington study (PMID 9678840, 1997) covered homes of 474 children aged 8 to 10. It found bedding levels “significantly higher in beds with kapok or inner sprung mattresses, or wool underlays and at relative humidities above the mean (51%)”. Its authors name the type and age of floor covering as the single most important factor for the house overall.

A survey of 80 Latrobe Valley homes (PMID 9860238, 1998) associated higher bed allergen levels with wool bedding and inner-spring mattresses (P < 0.001). Its regression model estimated up to a 70% reduction in bed allergen from avoiding wool bedding and inner-spring mattresses.

Read these as correlations from the 1990s, not as a ranking of fills. The abstracts do not say how the wool items were made, washed or aged, and mattress type and humidity moved alongside wool. The Melbourne comparison is the closest to wool itself, and it compares coverings with encasements. It does not show what happens with a wool item that is washed hot or fully enclosed.

What the allergy organisations advise

AAFA recommends zippered allergen-barrier covers on mattresses and pillows with pores too small to let mites and their waste through, and adds that “even if you cover your mattress and pillows, dust mites can still live in your bedding.” It advises weekly washing of sheets and blankets in hot water, at least 130 F, and indoor humidity between 30 and 50%. NIEHS gives the same 130 to 140 F wash advice, says non-washable bedding can be frozen overnight, and says that no matter how clean a home is, mites cannot be completely eliminated. Whether a wool item can take that wash is a care-label question we did not research. Our guides on dust mites and bedding and mite-proof cover pore size cover the covers; for fills see pillow fill types compared.

Lanolin: a patch-test allergy, documented separately

Lanolin is a different matter from mites. A 2023 review in Dermatitis (PMID 36917502) describes it as a complex mixture of esters, alcohols, sterols, fatty acids and hydrocarbons used for centuries as an emollient. It calls lanolin a weak sensitizer and reports contact allergy at 0.4% in the European population, with higher risk with atopic dermatitis, stasis dermatitis and leg ulcers, and in children and the elderly. It adds that patients with a positive patch test “may tolerate use of lanolin on normal skin”, and that the most appropriate patch-test preparation remains disputed.

Studies of patch-tested dermatitis patients report higher shares, which reflects who is tested. A 2019 study (PMID 30624788) of 594 patients found 28.6% reacting to at least one lanolin derivative; a 2018 study (PMID 28940210) of 9,577 patients found prevalence rising from 0.45% in 2004 to 1.81% in 2015. Neither describes wool bedding.

On cosmetic labels, the EU’s glossary of common ingredient names (Decision (EU) 2019/701) lists LANOLIN (entry 12915), LANOLIN ALCOHOL (12917), LANOLIN OIL (12920) and LANOLIN WAX (12922). That glossary is for cosmetics. We found no source on whether, or how much, lanolin remains in finished wool bedding or how it is labelled there, so we do not say.

Itch: not shown to be an allergy

We found one PubMed record on fabric prickle and itch, a 1995 review of textile dermatitis (PMID 7554877). Its abstract says only that the review includes studies that help explain fabric-induced prickle and itch. It does not say what causes wool itch, so we do not call it irritation or allergy. Others in our results concerned sheep breeding and fleece traits, not skin. If a wool product irritates you, a clinician or an allergy or dermatology society can say what is going on; patch testing is a clinical matter.

Using this when you shop

• If mites are the concern, the evidence above concerns the covering you sleep against. An allergen-impermeable encasement had far lower measured Der p 1 than wool, sheepskin or cotton coverings in Melbourne. Our mattress protector roundup and pillow protector roundup are the place to start.
• If you want a wool layer anyway, see the mattress topper roundup. It applies the same evidence rules as the other roundups, and this page does not describe wool as hypoallergenic.
• Wool comforters and pillows fall under the same mite findings; see the comforter, pillow and bedding roundups. For sheets, see hypoallergenic sheets and, for a full mattress, hypoallergenic mattresses.
• A label claim of “allergy tested” or “allergy friendly” is different from a certification. Our guide on allergy-certified bedding labels explains the difference, and for a child’s bed see nursery bedding.

What we don’t fully know

We found no head-to-head test of modern wool bedding against synthetic or cotton bedding for mite allergen, no source on lanolin content of wool bedding, and no source on what makes wool itch. The mite studies are old home surveys read as abstracts. The details are listed under “unknowns” on this page. For allergy questions about yourself or a child, ask a clinician.