Technical detail
The term is used in the cosmetic and fragrance industry to distinguish between allergens subject to mandatory label disclosure and allergens that are simply restricted or banned by IFRA. A declarable allergen is not prohibited; it may be present in the formula at any level, but its presence above the threshold must be communicated to consumers via INCI labeling (IFRA FAQ, accessed 2026-05-27).
The original EU list contains 26 substances (the "26 allergens"). A 2023 Commission amendment extended mandatory disclosure to a larger set of substances; implementation timelines apply to products placed on the market after the effective date. In niche perfumery with heavy use of naturals, allergen lists on packaging can exceed ten items on a single bottle label (EU Commission Delegated Regulation 2023/1545, accessed 2026-05-27).
Examples
- Limonene: ubiquitous in citrus oils; declared on virtually every eau de cologne and fresh fragrance.
- Linalool: present in lavender, coriander, and many florals; declared in fougère and aromatic families.
- Citronellol: core constituent of rose absolute and geranium; declared in most rose-based compositions.
Sources
- EU Cosmetics Regulation 1223/2009, Annex III (accessed 27 May 2026)
- IFRA FAQ on allergen declaration (accessed 27 May 2026)
- EU Commission Delegated Regulation 2023/1545 (accessed 27 May 2026)