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Phenolphthalein

CAS 77-09-8 · 100/100 · High conf.

Also registered as 7 other CAS numbers

81-90-3 · 467-29-8 · 57214-20-7 · 390417-24-0 · 546094-13-7 · 1541170-18-6 · 5768-87-6

Phenolphthalein chemical structure

Concern score

100/100Critical concern driven by cmr.
High confidence

Phenolphthalein in plain language

What it is

Also known as Yellow phenolphthalein · White phenolphthalein · Phenolphthalin · Phenpolphthalein · 3,3-Bis(4-hydroxyphenyl)phthalide (Phenolphthalein (INN)) · 3,3-BIS(P-HYDROXYPHENYL)PHTHALIDE

Show all 36 names

3,3-Bis(4-hydroxyphenyl)-2-benzofuran-1(3H)-one · 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one · 1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)- · 3,3-BIS (p-hydroxy-phenyl)-phthalide · 3,3-Bis(4-hydroxyphenyl)-1-(3H)-isobenzofuranone · 3,3-Bis(4-hydroxyphenyl)phthalide · Chocolax · Colax · Correctol · Dihydroxyphthalophenone · Espotabs · Euchessina · Koprol · Laxin · Laxogen · Medilax · Phenolax · Phenolphtaleine · Phthalimetten · Phthalin · Purga · Purgen · Purgophen · Spulmako-lax · Trilax · fenolftaleina · phenolphtalein · phenolphthalein powder · phenolphthalein. nature of hazard: irritant. · phenopthalein (<0.01%)

What it does

We don't have a plain-language description for Phenolphthalein yet.

Recorded functional uses: Not reported · No specific technical function

Is it a concern?
Critical concern: classified for carcinogenic, mutagenic or reproductive toxicity (CMR). It is banned in EU cosmetics.

Why it's flagged

  • Cmr

3,3-Bis(4-hydroxyphenyl)phthalide (Phenolphthalein (INN)) 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.

  • In marketed US drugs
  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Cleaning
  • Pharma
  • Food
  • Industrial
  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Carcinogenic Cat. 1A(C=>1%),Carcinogenic Cat. 1B(),Mutagenic Cat. 2(),Reprotoxic Cat. 2()

    banned
    View source →
  • EUCosIngActive2 entries
  • USEPAcommercial use observedEPA CPDat observed this chemical in 162 composition records across product categories including Laboratory supplies, Raw materials, Landscape/yard. EPA CPDat classifies this chemical for functional uses including No specific technical function.
    • EPA CPDat observed this chemical in 162 composition records across product categories including Laboratory supplies, Raw materials, Landscape/yard. EPA CPDat classifies this chemical for functional uses including No specific technical function.Source →
  • USFDAmarketed drug occurrenceFDA NDC lists this ingredient in 1 active drug products and 1 total products.
    • FDA NDC lists this ingredient in 1 active drug products and 1 total products.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 Phenolphthalein. 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 Phenolphthalein yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

8 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →
  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2011-01-07

    Open →
  • EPA Chemical and Products Database

    exposure · updated March 8, 2019

    Open →
  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →
  • FDA National Drug Code Directory

    regulatory · updated 2026-12-31

    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.

Food use

Food-use source coverage is present in the current record.

Good fit

The ingredient appears in food-oriented source coverage or allowed-use references, which makes food use easier to support than a context with no domain signal at all.

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 Phenolphthalein in a product composition. These are source records, not Greenveil catalog products.

Source records

162

Named organisations

6

Laboratory suppliesRaw materialsLandscape/yardCleaning and safetyFood and drug

Typical roles

Not reportedNo specific technical function
See products using Phenolphthalein →