Is CYSTEIC ACID safe to use in EU cosmetics?

CYSTEIC ACID is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Always verify against the current official CosIng database before formulating.

InventoryRef 5556915/10/2010

CYSTEIC ACID

Q: How do I check if my formula contains CYSTEIC ACID?

Use the INCI Checker tool on CosIng Checker to paste your full ingredient list and scan it against all EU annex records and allergen flags in one step.

L-3-Sulfoalanine

CYSTEIC ACID is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Inventory details for CYSTEIC ACID

INCI name

CYSTEIC ACID

Description

L-3-Sulfoalanine

Annex records for CYSTEIC ACID

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Key data

CAS

498-40-8 / 13100-82-8

207-861-3

Restriction

—

Function

SKIN CONDITIONING

How CYSTEIC ACID appears in the CosIng inventory

The CosIng inventory lists CYSTEIC ACID as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

CYSTEIC ACID is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

CYSTEIC ACID is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, CYSTEIC ACID carries the following function designation(s):

SKIN CONDITIONING

CAS 498-40-8 / 13100-82-8 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Use the INCI Checker tool to paste your full ingredient list and scan it against all EU annex records and allergen flags in one step.

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Source note for CYSTEIC ACID

This page reproduces the CosIng inventory entry for CYSTEIC ACID from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research CYSTEIC ACID and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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