The ingredient, explained
Hydroxycitronellal
Human testing examined hydroxycitronellal sensitization.
Ingredient guide
What it is and what it does
7-Hydroxycitronellal
About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗
- Perfuming
- A formulation role for perfume and aromatic raw materials that give a product its scent.
Function definitions: Danish Environmental Protection Agency: Cosmetic fragrance functions ↗
Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.
A closer look
What the research shows
Human contact allergy research
The fragrance produced sensitization in predictive testing; later product tolerance varied.
What this does not tell us
Selected volunteers and historical protocols cannot establish universal tolerance.
Sources for this summary. PubMed 12145447 ↗
Research review checked Oct 1, 2026
Read exact local candidate abstracts first; select identity-relevant papers; targeted primary PubMed/publisher searches. This is not an exhaustive systematic review.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Human contact allergy research · n=41
Sensitization methodology and primary prevention of the research institute for fragrance materials. ↗
Dermatology (Basel, Switzerland) · 2002
Follow the formula
Products containing this ingredient
From the wider catalogue. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
Registry identity
7-Hydroxycitronellal
- INCI name on ingredient lists
- HYDROXYCITRONELLAL
- CAS registry number
- 107-75-5
- EC number
- 203-518-7
Sources for this ingredient record
- EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗ · ODbL 1.0 (Open Beauty Facts database) · Recorded Aug 8, 2026