Hydroxycitronellal
Hydroxycitronellal is a known skin sensitizer and is one of the 26 fragrance allergens that must be declared on EU cosmetic labels. EU SCCS classified it among 'established contact allergens in humans'.
What it is
Synthetic aromatic aldehyde used as a fragrance/flavoring agent (lily-of-the-valley scent).
Flavoring substance (FEMA GRAS); cosmetic fragrance.
Why it's flagged
- skin sensitizer/contact allergen (EU 26 fragrance allergen list)
What regulators actually say
"Hydroxycitronellal must be declared in the list of ingredients when its concentration exceeds 0.001% in leave-on or 0.01% in rinse-off products."
"Hydroxycitronellal is categorized as an established contact allergen in humans."
Regulatory status
United States — FDA
FEMA GRAS as flavoring (limited use)
European Union — EFSA
Restricted in cosmetics; declared allergen under EU Cosmetics Regulation
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