What function does HYDROXYPROLINE serve in cosmetics?

According to the EU CosIng inventory, HYDROXYPROLINE carries the following function designation(s): ANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING.

What other records share CAS 51-35-4?

CAS 51-35-4 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

InventoryRef 3452515/10/2010

HYDROXYPROLINE

Q: How do I check if my formula contains HYDROXYPROLINE?

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-4-hydroxyproline

HYDROXYPROLINE 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 HYDROXYPROLINE

INCI name

HYDROXYPROLINE

Description

L-4-hydroxyproline

Annex records for HYDROXYPROLINE

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Key data

CAS

51-35-4

200-091-9

Restriction

—

Function

ANTISTATIC HAIR CONDITIONING SKIN CONDITIONING SURFACTANT - CLEANSING

How HYDROXYPROLINE appears in the CosIng inventory

The CosIng inventory lists HYDROXYPROLINE 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.

HYDROXYPROLINE is also tagged with 4 cosmetic functions 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

HYDROXYPROLINE 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, HYDROXYPROLINE carries the following function designation(s):

CAS 51-35-4 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.

View CAS records

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 HYDROXYPROLINE

This page reproduces the CosIng inventory entry for HYDROXYPROLINE 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 HYDROXYPROLINE 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

Check your formula

Scan a full INCI list to detect HYDROXYPROLINE and any linked EU annex restrictions or allergen flags.

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