Best Non-Toxic Laundry Detergent UK (2026): Fragrance-Free and Non-Bio Picks

What is a non-toxic laundry detergent?

In practice, it means a detergent that leaves fewer residues on fabric that sits against your skin all day. The evidence-backed priorities are: no added fragrance (the most common laundry-related skin trigger), non-bio if you have eczema or very sensitive skin (no enzymes), and ideally no optical brighteners (dyes that coat fabric to make it look whiter). Fragrance is the big one. The NHS lists perfumes, preservatives and detergents among common causes of contact dermatitis (NHS), and in a UK survey 27.8% of adults reported health problems from fragranced products (Steinemann, 2018).

Our picks at a glance

How we chose

We surveyed fragrance-free and "sensitive" detergents sold in the UK across liquids, powders, capsules and alternatives. To be a main pick, a detergent had to have no added fragrance and a published ingredient list. Products with an independent allergy accreditation (Allergy UK) scored highest; brand-only "dermatologically approved" claims scored lower. We included one mainstream fragranced detergent purely as a comparison. Prices were checked on brand sites and UK supermarkets in October 2026.

The best non-toxic laundry detergents in the UK

Ecover Zero Non Bio Sensitive: best overall

Zero fragrance, zero enzymes and zero colouring, with Ecover's Zero laundry range listed on Allergy UK's endorsed products page. It is sold in most supermarkets and has 5L and 15L refills, so it is easy to stick with. Caveat: it contains sodium lauryl sulfate, which can irritate skin in concentrated form, and like all non-bio liquids it is weaker on protein stains such as blood and grass.

Bio-D Non Bio Fragrance Free: best budget

A soap-based liquid with a short ingredient list, accredited as Allergy Friendly by Allergy UK, at up to 33 washes for about £5. Caveat: soap-based formulas can leave residue in very hard water, and it showed as out of stock on Bio-D's own shop when we checked.

smol Fragrance Free Non-Bio Capsules: best capsules

smol's fragrance and colour-free capsule is listed by Allergy UK and accredited by the Skin Health Alliance, and arrives by letterbox subscription. Caveat: smol's own ingredient list includes disodium distyrylbiphenyl disulfonate, an optical brightener designed to stay on fabric (smol ingredients).

Surcare Non Bio Laundry Capsules: best supermarket sensitive brand

Free from fragrance, dyes and enzymes, from a brand built around sensitive skin. Caveat: the capsules contain optical brighteners, and "dermatologically approved" is not attributed to a named independent body.

Greenscents Organic Laundry Liquid (Nonscents): best premium

Soil Association certified organic, with no SLS, enzymes, optical brighteners or fragrance in the Nonscents version. Caveat: at about 20 washes per 500ml it costs roughly 44p a wash, and its soap nut and shikakai cleaning power has not been independently compared with mainstream detergents.

Koh Sensitive Laundry Liquid: best fragrance-free bio

If you want stain power without fragrance, Koh keeps enzymes in and carries the Dermatest seal and Sensitive Choice approval. Caveat: it is effectively a bio detergent, which many people with eczema prefer to avoid.

Ecoegg Laundry Detergent Egg Sensitive Skin: alternative

Fragrance-free pellets in a reusable egg with no PVA film, no optical brighteners and Allergy UK approval (brand stated), from about 7p a wash with refills. Caveat: we found no independent testing showing laundry eggs clean as well as detergent, so keep it for lightly soiled loads. It was sold out on the brand site when we checked.

Fairy Non Bio For Sensitive Skin: the mainstream benchmark

We include Fairy because it is what many households already use. It cleans well and carries the Skin Health Alliance seal, but the label lists perfumes, optical brighteners and the preservative benzisothiazolinone. It shows that "sensitive" on a mainstream bottle does not mean fragrance-free.

Bio or non-bio: which is better for sensitive skin?

Bio detergents contain enzymes (proteins such as protease and amylase) that break down food, blood and grass stains at low temperatures. Products containing the enzyme subtilisin must carry the notice "may produce an allergic reaction", which you will see on several dishwasher tablets in our dishwasher guide. For skin, the evidence is less clear, and many people use bio detergent without problems. Non-bio is the cautious choice for babies, eczema and anyone reacting to laundry. Whatever you choose, fragrance-free matters more than bio versus non-bio.

Are optical brighteners a problem?

Optical brighteners are dyes that absorb ultraviolet light and re-emit it as blue light, so whites look brighter. They are designed to stay on fabric, so they add to what touches your skin. UK law requires them to be listed if added (Detergents Regulation, Annex VII), which makes them easy to spot. The evidence of harm at laundry levels is limited, so we treat them as a "nice to avoid" rather than a red flag. Ecover Zero, Bio-D, Greenscents and Ecoegg do not list them; smol, Surcare and Fairy do.

What does the label have to tell you?

The UK version of the EU Detergents Regulation requires labels to list perfumes, optical brighteners, enzymes and disinfectants whenever they are added, preservatives by name, and specific allergenic fragrance ingredients (such as limonene, linalool, citronellol and hexyl cinnamal) above 0.01% (Annex VII). So the quickest check is the small print on the back: if it says "perfumes" or names any of those allergens, it is not fragrance-free.

What about PVA in laundry capsules?

Most capsules use a water-soluble film of polyvinyl alcohol (PVA). A 2021 study estimated that a large share of PVA from US detergent pods may not fully break down in wastewater treatment (Rolsky and Kelkar, 2021). That estimate is modelled and was funded by a company selling PVA-free products, so the issue is genuinely contested. If it matters to you, a liquid or powder sidesteps it entirely.

What to avoid

• Scent boosters, "fresh linen" fragrances and fabric conditioners with perfume; they are designed to leave fragrance on fabric for days.
• Overdosing: more detergent means more residue. Use the lower dose line for soft water and normal soiling.
• Preservatives such as methylisothiazolinone if you have a known allergy (Regulation 2016/1198).

For other swaps, see our hub guide to non-toxic cleaning products and our guides to dishwasher tablets and washing up liquid.

Bottom line

Go fragrance-free first, non-bio if anyone has eczema, and skip optical brighteners if you can. Ecover Zero Non Bio is the easiest all-round pick because it ticks all three and is sold in every supermarket. Bio-D Fragrance Free does the same job for about half the cost per wash, and smol's fragrance-free capsules are the best capsule option, with the caveat of an optical brightener.