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Pyrithione sodium (INNM) (2)

CAS 3811-73-2 · 100/100 · High conf.

Also registered as 4 other CAS numbers

15922-78-8 · 5412-36-2 · 75164-71-5 · 878632-79-2

Pyrithione sodium (INNM) (2) chemical structure

Concern score

100/100Critical concern based on regulatory listings.
High confidence

Pyrithione sodium (INNM) (2) in plain language

What it is

On cosmetic ingredient lists it appears as “Sodium pyrithione”.

Also known as Sodium pyrithione · Pyrithione sodium · Sodium (2-pyridylthio)-N-oxide · Sodium 1-oxidopyridin-1-ium-2-thiolate · 1-Hydroxy-2(1H)-pyridinethione, sodium salt · 2(1H)-PYRIDINETHIONE, 1-HYDROXY-, sodium salt

Show all 29 names

2-PYRIDINETHIOL-1-OXIDE, sodium salt · Omadine sodium · Pyrithione sodium salt · Sodium salt of 1-HYDROXY 2(1H)-PYRIDINE thione · Sodium 1-oxo-1lambda~5~-pyridine-2-thiolate · (1-Hydroxy-2-pyridinethione), sodium salt · (1-Hydroxy-2-pyridinethione), sodium salt, tech. · 2(1H)-PYRIDINETHIONE, 1-HYDROXY-, sodium salt (1:1) · 2-Mercaptopyridine 1-oxide sodium salt · 2-Mercaptopyridine N-oxide sodium salt · 2-Mercaptopyridine oxide sodium salt · 2-Pyridinethiol, 1-oxide, sodium salt (1:1) · 2-pyridinethiol, 1-oxide, sodium salt · AL-02725 · AL02725 · Omacide 24 · Pyridine-2-thiol 1-oxide, sodium salt · Sodium omadine · Tomicide s · Topcide 280 · industrial fungicide · sodium 2-pyridine thio n-oxide · sodium-2-pyridinethiol-n-oxide

What it does

Used in consumer products as an antimicrobial.

  • Antimicrobial
Is it a concern?
Critical concern: no hazard classifications on record. It is banned in EU cosmetics.

Why it's flagged

Pyrithione sodium (INNM) (2) is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — banned

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Cleaning
  • Industrial

  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.

    banned
    View source →
  • EUCosIngActiveCosmetics Regulation annex II / ref 369.
    • Cosmetics Regulation annex II / ref 369.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 20 composition records across product categories including Laboratory supplies, Cleaning products and household care, Specialty occupational products. EPA CPDat classifies this chemical for functional uses including Biocide.
    • EPA CPDat observed this chemical in 20 composition records across product categories including Laboratory supplies, Cleaning products and household care, Specialty occupational products. EPA CPDat classifies this chemical for functional uses including Biocide.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Pyrithione sodium (INNM) (2). These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Pyrithione sodium (INNM) (2) yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2010-10-20

    Open →

  • EPA Chemical and Products Database

    exposure · updated november 21, 2016

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often EPA CPDat has listed Pyrithione sodium (INNM) (2) in a product composition. These are source records, not Greenveil catalog products.

Source records

20

Named organisations

5

Laboratory suppliesCleaning products and household careSpecialty occupational productsRaw materialsConstruction and building materialsIndustrial products

Typical roles

Antimicrobial
See products using Pyrithione sodium (INNM) (2) →

Catalog

Found in these products

Their ingredient lists include Pyrithione sodium (INNM) (2); each product's own rating depends on its whole formula, so it is shown on the product page, not here.

See all 20 →Find products without it →