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Benzylidene camphor sulfonic acid

CAS 56039-58-8 · 20/100 · High conf.

Benzylidene camphor sulfonic acid chemical structure

Concern score

20/100Minor concern based on regulatory listings.
High confidence

Benzylidene camphor sulfonic acid in plain language

What it is

Also known as 4'-SULFO-3-BENZYLIDENECAMPHOR · Benzylidene camphor sulfonic acid, (±)- · P-((2-OXO-3-BORNYLIDENE)METHYL)BENZENESULFONIC acid · (+/-)-benzylidene camphor sulfonic acid · (±)-benzylidene camphor sulfonic acid · Benzylidene camphor sulfonic acid, (+/-)-

Show all 10 names

Mexoryl sl · Q27274650 · UNII-BG521Q2MGT · alpha-(2-Oxoborn-3-ylidene)toluene-4 sulphonic acid

What it does

Used in cosmetics as a UV filter and a light stabiliser.

  • UV filter
  • UV absorber
  • Light stabilizer
Is it a concern?
Minor concern: no hazard classifications on record. It is listed for cosmetic use in the EU.

What the listings say

Permitted, with conditions — Benzylidene camphor sulfonic acid appears on published "allowed" regulatory lists rather than on a restriction list.

alpha-(2-Oxoborn-3-ylidene)toluene-4-sulphonic acid and its salts is listed in Annex VI of the EU Cosmetics Regulation (EC) 1223/2009 (UV filters allowed in cosmetic products).

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

No restrictions found. Benzylidene camphor sulfonic acid appears in these published regulatory listings.

  • EU Annex VI — permitted UV filter
  • EU permitted UV filter

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActive2 entries
    • Benzylidene Camphor Sulfonic Acid is the organic compound that conforms to the formula: Restriction: VI/9Source →
    • Cosmetics Regulation annex VI / ref 9.Source →
  • EUECallowed_listedAnnex VI of EU Cosmetics Regulation (EC) 1223/2009: UV filters allowed in cosmetic products. Maximum concentration: 6%(as acid)
    • Annex VI of EU Cosmetics Regulation (EC) 1223/2009: UV filters allowed in cosmetic products. Maximum concentration: 6%(as acid)Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including UV stabilizer.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including UV stabilizer.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 Benzylidene camphor sulfonic acid. 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 Benzylidene camphor sulfonic acid yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2010-10-26

    Open →

  • EPA Chemical and Products Database

    exposure · updated 23/01/2020

    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 Benzylidene camphor sulfonic acid in a product composition. These are source records, not Greenveil catalog products.

Named organisations

1

Typical roles

UV filterUV absorberLight stabilizer
See products using Benzylidene camphor sulfonic acid →