Is ISOLEUCINE safe to use in EU cosmetics?

ISOLEUCINE 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.

What function does ISOLEUCINE serve in cosmetics?

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

InventoryRef 3466215/10/2010

ISOLEUCINE

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

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-Isoleucine; DL-allo-Isoleucine; 2-Amino-3-methylpentanoic acid

ISOLEUCINE 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 ISOLEUCINE

INCI name

ISOLEUCINE

INN name

isoleucine

Description

L-Isoleucine; DL-allo-Isoleucine; 2-Amino-3-methylpentanoic acid

Annex records for ISOLEUCINE

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Key data

CAS

73-32-5 / 443-79-8

200-798-2 / 207-139-8

Restriction

—

Function

ANTISTATIC HAIR CONDITIONING SKIN CONDITIONING

How ISOLEUCINE appears in the CosIng inventory

The CosIng inventory lists ISOLEUCINE 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.

ISOLEUCINE is also tagged with 3 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

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

CAS 73-32-5 / 443-79-8 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 ISOLEUCINE

This page reproduces the CosIng inventory entry for ISOLEUCINE 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 ISOLEUCINE 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 ISOLEUCINE and any linked EU annex restrictions or allergen flags.

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Search similar ingredients

Find other inventory ingredients and annex entries related to ISOLEUCINE, its identifiers or nearby name variants.