Fragrance allergens / Hydroxycitronellal

Hydroxycitronellal

Hydroxycitronellal must be declared in the EU, Northern Ireland and Great Britain once it crosses the threshold.

Identity

Name in the ingredient list	Hydroxycitronellal
CAS / EC number	107-75-5 / EC 203-518-7
EU Annex III entry	72
GB Annex III entry	72

It is one of the long-standing entries, carried unchanged through the 2023 expansion.

When it must appear on the label

Hydroxycitronellal may be present as a constituent of essential oils or fragrance compounds. It must be named individually in the ingredient list when its total concentration in the finished product exceeds 0.001% in leave-on products (lotions, balms) or 0.01% in rinse-off products (soap, shower gel), summed across every fragrance source in the recipe. Below the threshold it stays within the collective term "Parfum".

United States: no individual fragrance-allergen labelling is in force yet (MoCRA rulemaking pending); fragrance is declared collectively as "Fragrance".

Common questions

Do I have to list Hydroxycitronellal on my label?

Hydroxycitronellal must be declared in the EU, Northern Ireland and Great Britain once it crosses the threshold. It must be named individually once it exceeds 0.001% of a leave-on product or 0.01% of a rinse-off product, summed across every fragrance source in the recipe. Below that it stays inside the collective term "Parfum".

What is the CAS number for Hydroxycitronellal?

Hydroxycitronellal is listed under CAS 107-75-5 (EC 203-518-7), Annex III entry 72.

Sources

Regulation (EC) No 1223/2009, Annex III (consolidated text of 01.05.2026), entries 67 to 92 (EUR-Lex)
Assimilated Regulation (EC) No 1223/2009, Annex III, as it applies in Great Britain, entries carrying the individual-declaration condition (legislation.gov.uk)

Transcribed from the official texts linked above and source-audited against them; a labelling reference, not safety advice. You remain responsible for your product's compliance.

Rule tables last checked 21 August 2026.