Is Formamidine Sulfinic Acid safe in cosmetics?
Formamidine Sulfinic Acid has a safety rating of "MODERATE" in our database. EU status: prohibited. US status: permitted.
Moderate
Cosmetic Ingredient
Formamidine Sulfinic Acid
Also known as: EINECS 217-157-8, Methenesulfinic acid, aminoimino-, Thiourea S,S-dioxide
INCI: FORMAMIDINE SULFINIC ACID
Formamidine Sulfinic Acid (CAS 1758-73-2) is a cosmetic cosmetic ingredient functioning as Reducing agent for hair dye and color removal. EU Regulation 1223/2009 status: prohibited. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
View industrial chemical safety profile for CAS 1758-73-2 →
Auto-generated CPSR Part A draft with source citations
Cross-Vertical Regulatory Divergence
Formamidine Sulfinic Acid is prohibited in EU cosmetics but has active industrial GHS classifications (H251, H252, H302, H315, H318, H319, H332, H335).
Source: Cosmetics: ingredients.eu_status; Chemicals: ghs_classifications.signal_word/hazard_statement_code
Function
Reducing agent for hair dye and color removal
Safety Rating
MODERATE
Chemistry & Identifiers
IUPAC Name
amino(imino)methanesulfinic acid
InChIKey
FYOWZTWVYZOZSI-UHFFFAOYSA-N
Regulatory Status
EU EU Status
prohibited
US US Status
permitted
US Notes
Permitted — not restricted under 21 CFR for cosmetic use
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Formamidine Sulfinic Acid.
Calculate MoS for your specific formulation with the MoS Calculator.
ECHA REACH Registration
European Chemicals Agency REACH dossier and Substances of Very High Concern listing.
Registration Type
Full
Tonnage Band
1,000 - 10,000 tonnes
Substance Type
SUBSTANCE; GROUP
SVHC Candidate
No
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Reducing agent
Expert Verdict
Expert safety assessment and concern-level summary for Formamidine Sulfinic Acid.
Known Synonyms
EINECS 217-157-8
Methenesulfinic acid, aminoimino-
Thiourea S,S-dioxide
Chemical Function
Reducing agent
Australian Status
AICIS status: listed
Frequently Asked Questions
Is Formamidine Sulfinic Acid allowed in the EU?
Formamidine Sulfinic Acid EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.
What does Formamidine Sulfinic Acid do in cosmetics?
Formamidine Sulfinic Acid functions as: Reducing agent for hair dye and color removal. It is classified as a cosmetic ingredient in our database. CAS number: 1758-73-2.
Is Formamidine Sulfinic Acid used outside cosmetics?
Formamidine Sulfinic Acid also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Does Formamidine Sulfinic Acid have different safety status in cosmetics vs industrial chemicals?
Formamidine Sulfinic Acid is prohibited in EU cosmetics but has active industrial GHS classifications (H251, H252, H302, H315, H318, H319, H332, H335).
Compliance Tools
Check Formamidine Sulfinic Acid compliance across multiple jurisdictions:
Ingredient Decoder
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82 Allergen Checker
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Substance Compliance
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MoS Calculator
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Heavy Metal Limits
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