Zinc Pyrithione: Effective, So Why Did the EU Ban It?
INCI: Zinc Pyrithione · also listed as ZPT, Pyrithione zincFor sixty years it was the default anti-dandruff ingredient worldwide. Since March 2022 it has been prohibited in EU cosmetics entirely - a decision that says more about hazard classification than about your scalp.
Works very well, and is no longer legal in EU cosmetics
A genuinely effective antifungal: it suppresses Malassezia, the yeast driving dandruff and seborrheic dermatitis, and decades of use back that up. Nobody disputes that it works.
It was banned across the EU from 1 March 2022 after being classified a category 1B reproductive toxicant. EU cosmetics law prohibits CMR-classified substances almost automatically, so the ban followed from the classification rather than from evidence of harm to shampoo users. It remains legal and widely sold in the US. In Europe this is now a historical entry - what matters is what replaced it.
- INCI name
- Zinc Pyrithione
- Also on labels
- ZPT, pyrithione zinc, zinc omadine. US products often say "pyrithione zinc" in the Drug Facts panel, because there it is an over-the-counter drug active.
- Job in hair care
- Antifungal scalp active. It reduces Malassezia populations, cutting the inflammation, itching and flaking that make up dandruff.
- Found in
- Anti-dandruff shampoos in the US, Canada and much of Asia. No longer in any compliant EU or UK cosmetic product.
- Typical level
- 1–2% in a US anti-dandruff shampoo; effective from around 0.3%.
- Regulatory status
- Prohibited in the EU and UK since 1 March 2022 (Regulation (EU) 2021/1902). Permitted in the US as an OTC anti-dandruff drug active.
- Hairmony class
- ActiveScored by the Hairmony engine, so it actually moves which products you get recommended.
- Scored for
- +anti-dandruff+scalp health−EU availabilityA high-potency anti-dandruff active. Our EU and US catalogues differ here: EU formulas have moved to piroctone olamine and climbazole.
Why the EU banned it
Zinc pyrithione was classified toxic for reproduction, category 1B under the EU's chemical rules. EU cosmetics law prohibits CMR-classified substances almost automatically, so the ban followed mechanically, taking effect on 1 March 2022 and applying to stock already on shelves.
The distinction that matters: this was a hazard classification, not a finding that shampoo users were harmed. Hazard describes what a substance can do in principle; risk describes what it does at real exposure. EU law is deliberately precautionary — a policy choice, and the science alone does not settle whether it is the right threshold.
What we based this on
- The regulation. Regulation (EU) 2021/1902 added zinc pyrithione to Annex II (prohibited substances), effective 1 March 2022.
- The reason. A CMR category 1B classification for reproductive toxicity under the 15th ATP to the CLP Regulation — regulatory summary.
What replaced it in Europe
The replacements are good. Piroctone olamine is the closest like-for-like swap and is what most European anti-dandruff shampoos now use — comparable efficacy, gentler on colour. If a US-bought ZPT shampoo worked for you, that is the one to look for at home.
| Active | How it works | Notes |
|---|---|---|
| Piroctone olamine | Antifungal | The main EU replacement; gentler on colour |
| Climbazole | Antifungal | Often paired with piroctone olamine |
| Selenium disulfide | Antifungal, slows cell turnover | Stronger; can discolour treated hair |
| Ketoconazole | Antifungal | Pharmacy or prescription; the strongest option |
| Salicylic acid | Loosens flakes | Clears scale but does not treat the yeast |
Relevant to you if
- You are in the US, Canada or much of Asia
- You have persistent, yeast-driven dandruff
- Piroctone olamine and climbazole have not worked
Look elsewhere if
- You are shopping in the EU or UK
- You are pregnant or trying to conceive
- Your flaking is dry scalp, not dandruff
In practice: contact time beats strength — leave any anti-dandruff shampoo on the scalp for three to five minutes, and keep using it weekly once it clears.
Not medical advice. This page describes how an ingredient behaves on hair and scalp. If you have a persistent rash, sores, sudden shedding or a diagnosed scalp condition, see a dermatologist before changing anything.
Frequently asked
Is zinc pyrithione dangerous?
The EU classified it a category 1B reproductive toxicant and banned it from cosmetics in March 2022 on that basis. That is a hazard classification from toxicological studies, not evidence that shampoo users were harmed - and US regulators still permit it. If you are pregnant, choosing an alternative is a reasonable precaution.
Why can I still buy it online in Europe?
Grey imports and non-compliant listings. Any product legally sold in the EU or UK since March 2022 cannot contain it. If you find one on a marketplace it is old stock, an import, or mislabelled, and has not been assessed against EU cosmetic safety requirements.
What is the best replacement for zinc pyrithione?
Piroctone olamine is the closest like-for-like swap and what most European anti-dandruff shampoos moved to, with comparable efficacy against Malassezia and gentler treatment of coloured hair. Climbazole is often paired with it; ketoconazole is the strongest option.
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