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Piroctone Olamine in skincare
European-preferred anti-dandruff active; antifungal against Malassezia; gentler than zinc pyrithione on sensitized scalps.
Used in anti-dandruff shampoos (rinse-off, AM and PM appropriate) and some leave-on scalp treatments. In leave-on scalp serums: both AM and PM fine. More commonly used in EU markets; zinc pyrithione and ketoconazole are more common in the US. No photosensitivity.
What it is
Piroctone Olamine (Octopirox, 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridinone ethanolamine salt) is a broad-spectrum antifungal preservative used as an active anti-dandruff ingredient in shampoos and scalp treatments. Mechanism: inhibits fungal cell membrane ergosterol synthesis, targeting Malassezia furfur. The yeast responsible for dandruff (seborrheic dermatitis). More commonly used in Europe than in the US (where zinc pyrithione and selenium sulfide dominate). Advantages over zinc pyrithione: less astringency, better tolerance on sensitized or inflamed scalps, and some evidence of superior efficacy per unit concentration. EU permits piroctone olamine at up to 1% in rinse-off hair products and 0.5% in leave-on products. FDA has not granted GRASE status for piroctone olamine as an OTC anti-dandruff active, meaning anti-dandruff claims cannot be made in the US. Also functions as a mild preservative at low concentrations. Well-tolerated; rare sensitization.
The facts
| Category | Antifungal / Anti-dandruff Active |
| Typical use | Morning and evening |
| Concentration YARAI treats as a full dose | 0.5% |
| EU maximum permitted concentration | 0.5% (a) 1.0% b) 0.5%) |
| EU Cosmetics Regulation annex | V |
| EU status | restricted |
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. Piroctone Olamine at 0.5% and piroctone olamine 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
EU CosIng Annex V restricted substance. Max: a) 1.0% b) 0.5%
Common questions
What does piroctone olamine do in a skincare product?
European-preferred anti-dandruff active; antifungal against Malassezia; gentler than zinc pyrithione on sensitized scalps.
How much piroctone olamine should a product contain?
YARAI treats 0.5% 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 piroctone olamine restricted in the EU?
The EU Cosmetics Regulation permits this ingredient up to 0.5% in leave-on cosmetics, listed under V. a) 1.0% b) 0.5%
When should I use piroctone olamine?
Used in anti-dandruff shampoos (rinse-off, AM and PM appropriate) and some leave-on scalp treatments. In leave-on scalp serums: both AM and PM fine. More commonly used in EU markets; zinc pyrithione and ketoconazole are more common in the US. No photosensitivity.
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.