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Zinc Pyrithione in skincare
Gold-standard US anti-dandruff active (Head & Shoulders); FDA-approved at 0.3–2%; BANNED in EU cosmetics since March 2023 due to reproductive toxicity.
Used in anti-dandruff shampoos (rinse-off, AM and PM appropriate) and leave-on medicated scalp treatments. FDA-approved OTC anti-dandruff active in the US at 0.3–2%. Note: the EU banned zinc pyrithione as a cosmetic ingredient effective March 2023 due to reproductive toxicity classification (Repr. 1B under CLP Regulation). EU anti-dandruff products must reformulate to piroctone olamine, selenium sulfide, or ketoconazole.
What it is
Zinc Pyrithione (ZPT, zinc omadine) is a coordination complex of zinc and pyrithione with potent antibacterial and antifungal activity, serving as the active anti-dandruff agent in Head & Shoulders and many other anti-dandruff shampoos. Mechanism: disrupts the proton motive force across fungal cell membranes, targeting Malassezia yeast. FDA OTC anti-dandruff monograph: approved at 0.3–2% in shampoos and at 0.1–0.25% in conditioning products. Major regulatory divergence: the EU classified zinc pyrithione as a reproductive toxicant category 1B (Repr. 1B) under the EU CLP Regulation based on animal reproductive toxicity data, leading to a ban in all EU cosmetic products (rinse-off and leave-on) effective March 1, 2023. This means hundreds of anti-dandruff products had to be reformulated for EU markets. US, Canada, Australia, and other markets continue to permit its use. The reproductive toxicity concern is primarily from occupational/high-dose systemic exposure. The risk from rinse-off shampoo use is considered minimal by US/Canadian regulators, but the EU takes a precautionary stance.
The facts
| Category | Antifungal / Antibacterial / Anti-dandruff Active |
| Typical use | Morning and evening |
| Concentration YARAI treats as a full dose | 2% |
| EU maximum permitted concentration | 0.0% (banned in EU) |
| EU Cosmetics Regulation annex | II |
| EU status | banned |
Why the amount matters, not just the presence
Most ingredient checkers tell you whether something is in the bottle. That is a smaller question than it sounds. Zinc Pyrithione at 2% and zinc pyrithione at a trace level are not the same ingredient in any way that affects your skin.
An ingredient list is ordered by quantity, so position carries real information. YARAI reads that position and scores accordingly, which is why the same ingredient can land differently in two different products.
The honest limit: a list gives order, not percentages. Estimating concentration from position is an estimate. It is a better estimate than ignoring position, and it is still an estimate. We would rather tell you that than let a number look more certain than it is.
Regulatory status
BANNED in EU cosmetics since March 2022 (Annex II, CMR classification). In the US it remains an OTC anti-dandruff drug active, which is why shampoos still carry it.
Common questions
What does zinc pyrithione do in a skincare product?
Gold-standard US anti-dandruff active (Head & Shoulders); FDA-approved at 0.3–2%; BANNED in EU cosmetics since March 2023 due to reproductive toxicity.
How much zinc pyrithione should a product contain?
YARAI treats 2% as a full dose for this ingredient. Below that, the ingredient is present but is scored as contributing less. An ingredient list gives you the order of ingredients, not their percentages, so this is an estimate read from position rather than a measurement.
Is zinc pyrithione restricted in the EU?
The EU Cosmetics Regulation permits this ingredient up to 0.0% in leave-on cosmetics, listed under II. banned in EU
When should I use zinc pyrithione?
Used in anti-dandruff shampoos (rinse-off, AM and PM appropriate) and leave-on medicated scalp treatments. FDA-approved OTC anti-dandruff active in the US at 0.3–2%. Note: the EU banned zinc pyrithione as a cosmetic ingredient effective March 2023 due to reproductive toxicity classification (Repr. 1B under CLP Regulation). EU anti-dandruff products must reformulate to piroctone olamine, selenium sulfide, or ketoconazole.
Check your own products
Point your camera at a product. YARAI identifies it from the label, finds that product's full ingredient list from published sources, and scores it. No barcode and no box needed, which is how it handles imported and small-brand products.
Concern level, category and thresholds on this page are read directly from the same data the YARAI app scores with, so this page and the app cannot disagree. EU figures cite Regulation (EC) No 1223/2009. Last built 2026-09-09. Nothing here is medical advice.