ORY® product lines:
◐ Skincare (rinse-off body/face washes for seborrheic-prone skin; OTC labeling)
☑ Haircare (U.S. OTC dandruff active; hero)
◐ Handmade Soap (syndet/shampoo bars as OTC products; not cold-process)
☒ Cosmetics — U.S. OTC drug active; BANNED in EU cosmetics since March 2022
Zinc pyrithione (ZPT) is the world’s most-used anti-dandruff active and, in the United States, an FDA-monograph OTC drug ingredient for dandruff and seborrheic dermatitis at 0.3–2% (rinse-off) — the active that lets ORY® make true “controls dandruff” drug claims. It works by flooding Malassezia yeast cells with copper, which inactivates their iron–sulfur enzymes [1]; in a multicenter randomized trial, 1% ZPT shampoo was effective in severe dandruff and seborrheic dermatitis, though somewhat less potent than 2% ketoconazole [2]; and in a randomized controlled trial, 1% ZPT shampoo modestly increased hair density, adding a hair-retention dimension [3]. Two regulatory facts shape ORY®‘s use. First, any product with ZPT dandruff claims is an OTC drug requiring drug-facts labeling and cGMP. Second, the European Union banned zinc pyrithione from all cosmetics from 1 March 2022 after classifying it as a reproductive toxicant (CMR 1B) [4] — so ORY® restricts ZPT to U.S.-market OTC rinse-off products, offers piroctone olamine and climbazole as the cosmetic alternatives, and does not use it in leave-ons, cosmetics, or products for export to the EU.
What is Zinc Pyrithione made of?
Zinc pyrithione is a synthetic coordination complex of zinc with two pyrithione (pyridinethione) ligands, supplied as a fine, insoluble dispersion. Points to know [1, 4]:
- Mechanism: Ionophore — carries copper into fungal cells, inactivating iron–sulfur cluster proteins and halting growth [1].
- Physical form: Off-white, practically water-insoluble powder or 48% dispersion; must be suspended (thickener) in shampoos; particle size affects deposition.
- pH 4.5–9 stable; heat-stable; sensitive to strong chelators and some metals (copper, iron discoloration).
- Regulatory: U.S. FDA dandruff monograph 0.3–2% (rinse-off; 0.1–0.25% leave-on for body/scalp per monograph categories); EU: prohibited in cosmetics since March 2022 (CMR 1B) [4].
- Typical use: 1–2% shampoo; 0.5–1% body wash.
What skin type is best suited for Zinc Pyrithione?
ZPT is a rinse-off, OTC-labeled active for seborrheic-prone skin, not a general skincare ingredient:
- Oily: Body and facial washes for seborrheic dermatitis-prone areas (OTC labeling).
- Combination: Flaky T-zone/brow areas via rinse-off wash.
- Acne-prone: “Fungal acne” (Malassezia folliculitis) body washes.
- Sensitive: Generally tolerated rinse-off; patch test; not for leave-on facial use.
- Normal, Dry, Mature: Not indicated.
What hair type is best suited for Zinc Pyrithione?
ZPT is ORY®‘s U.S. OTC dandruff active for the scalp:
- Dandruff-prone scalp: The core use — FDA-monograph active; effective in severe dandruff and seborrheic dermatitis [2].
- Oily scalp: Controls sebum-loving Malassezia.
- Mature or thinning: Modest hair-density increase with 1% ZPT shampoo in a randomized trial [3]; healthier scalp environment.
- Straight, wavy, curly, coily: Rinse-off shampoos and shampoo bars; suspension must deposit on the scalp — massage in, leave 2–3 minutes.
- Sensitive scalp: Usually tolerated; alternate with piroctone olamine if irritated.
- Color-treated: Generally color-safe; can dull some semi-permanent shades — clarify.
- Dry or damaged: Pair with conditioner; ZPT is scalp-focused.
What are the benefits of Zinc Pyrithione?
ZPT’s benefits are supported by mechanistic, randomized, and regulatory evidence [1–4]:
- Dandruff control (drug claim, U.S.): FDA-monograph active; effective in severe dandruff/seborrheic dermatitis [2].
- Antifungal: Copper-ionophore mechanism against Malassezia [1].
- Antibacterial: Broad activity; used in seborrheic body washes.
- Hair-density support: Increased hair count in a randomized trial [3].
- Itch and flake reduction: Rapid relief with regular use.
- Long safety-in-use record (rinse-off): Decades of global use before the EU reclassification.
- Cost-effective: Inexpensive active.
Dual use across ORY® product lines
ZPT is a U.S. OTC rinse-off active for haircare and seborrheic-prone skin washes, usable in syndet/shampoo bars as OTC products; it has no cosmetics role and is banned in EU cosmetics.
| ORY® line | Dual use? | How it is used | Typical level |
|---|---|---|---|
|
ORY® Skincare |
Limited |
OTC-labeled body and facial washes for seborrheic dermatitis-prone or fungal-acne-prone skin (U.S. only). |
0.5–1% rinse-off |
|
ORY® Haircare |
Yes |
OTC anti-dandruff shampoos (drug-facts labeling); conditioner pairing (U.S. only). |
1–2% shampoo |
|
ORY® Handmade Soap |
Limited |
Syndet/shampoo bars formulated and labeled as OTC dandruff products (U.S. only); not cold-process bars. |
1–2% |
|
ORY® Cosmetics |
No |
No cosmetic role; leave-on facial/makeup use excluded; EU-prohibited. |
— |
Pros and cons of Zinc Pyrithione
Pros
Cons
- Enables true U.S. dandruff drug claims: Monograph active.
- Strong efficacy: [2].
- Randomized hair-density data: [3].
- Inexpensive: Cost-effective.
- Well-understood mechanism: [1].
- EU ban (CMR 1B): Prohibited in EU cosmetics since March 2022 [4]; not for EU export.
- OTC drug status: Drug-facts labeling and cGMP required in the U.S.
- Insoluble suspension: Needs suspending agents; can settle.
- Leave-on and cosmetics excluded: Rinse-off only in ORY® practice.
- Consumer perception: The EU classification concerns customers; ORY® should explain and offer piroctone olamine/climbazole.
- Discoloration with metals: Avoid iron/copper contamination.
What is the best application of Zinc Pyrithione?
ZPT is used in U.S. OTC rinse-off products:
- Anti-dandruff shampoo (OTC): 1–2% suspended; massage into scalp, leave 2–3 minutes, rinse; 2–3× weekly.
- Seborrheic body/face wash (OTC): 0.5–1%; leave 1–2 minutes.
- Shampoo bar (OTC): 1–2% in an SCI base.
- Alternatives: Piroctone olamine 0.5–1% or climbazole 0.3–0.5% for cosmetic (non-drug) and EU-compatible products.
Peer-reviewed references
- Reeder NL, Kaplan J, Xu J, et al. Zinc pyrithione inhibits yeast growth through copper influx and inactivation of iron-sulfur proteins. Antimicrobial Agents and Chemotherapy. 2011;55(12):5753–5760.
- Piérard-Franchimont C, Goffin V, Decroix J, Piérard GE. A multicenter randomized trial of ketoconazole 2% and zinc pyrithione 1% shampoos in severe dandruff and seborrheic dermatitis. Skin Pharmacology and Applied Skin Physiology. 2002;15(6):434–441.
- Berger RS, Fu JL, Smiles KA, et al. The effects of minoxidil, 1% pyrithione zinc and a combination of both on hair density: a randomized controlled trial. British Journal of Dermatology. 2003;149(2):354–362.
- European Commission. Commission Regulation (EU) 2021/1902 amending Annexes II, III and V to Regulation (EC) No 1223/2009 (zinc pyrithione prohibited from 1 March 2022). Official Journal of the European Union. 2021;L387:1–14. (Regulatory source.)
Disclaimer:
The information on this page is provided by ORY International, LC for educational purposes only. It summarizes published research and FDA rules about zinc pyrithione as an ingredient. It is not medical advice and does not replace advice from a dermatologist, physician, pharmacist, or other qualified healthcare provider.
OTC drug products: ORY® products labeled for dandruff or seborrheic dermatitis are over-the-counter drugs made and labeled under FDA rules (21 CFR Part 358, Subpart H; OTC Monograph M032). They are intended only for the uses stated on the Drug Facts label. Read and follow the Drug Facts label. If your scalp condition is severe or does not improve, see a dermatologist.
ORY® does not claim that zinc pyrithione grows hair or prevents hair loss. Zinc pyrithione is prohibited in cosmetics in the European Union. If you are pregnant, nursing, have a medical condition, or are buying for a child, ask a healthcare provider before use. Research cited here describes zinc pyrithione in published studies, not ORY® products specifically.
ORY International, LC works to keep this page accurate and current but makes no warranty as to its completeness. To the fullest extent permitted by law, ORY International, LC is not liable for any loss or injury arising from reliance on this information or from use of any product contrary to its label directions. To report a reaction, contact us at [insert contact email / phone].
