The essentials
The phrase "26 allergens" refers to the list of fragrance substances first required on cosmetic product labels in the European Union under the 7th Amendment to the Cosmetics Directive, namely Directive 2003/15/EC. These compounds were identified as known contact allergens or sensitizers by the Scientific Committee on Consumer Safety and included both natural components such as oakmoss and tree moss and synthetic molecules such as isoeugenol, cinnamal, and coumarin. They must be declared by their INCI name whenever present above 0.001 percent in leave-on products such as perfume and 0.01 percent in rinse-off products (European Commission, accessed 2026-05-29).
The list has since grown. EU Regulation 2023/1545, which amends EU Cosmetics Regulation 1223/2009, extends mandatory disclosure to 82 fragrance substances in total, adding 56 new entries to the original 26 (including substances previously listed only by group name). Compliance is phased: new products placed on the market must conform from 31 July 2026, and existing products on shelves must conform from 31 July 2028. The expansion was driven by updated SCCS opinions, particularly opinion SCCS/1459/11 and subsequent revisions (Cosmetics Europe, accessed 2026-05-29).
The IFRA Standards run in parallel. They are voluntary in legal terms, since IFRA is a trade body rather than a regulator, but they are observed industry-wide because compliance is a precondition for selling raw materials and finished compositions to global brands. The current standards are the 51st Amendment published in 2023, which restricts hundreds of ingredients by product category and use level based on safety assessments produced by the Research Institute for Fragrance Materials.
The original 26 substances
The 26 substances published in 2003 cover several chemical families: naturally occurring aromatic alcohols and esters such as linalool, geraniol, citronellol, farnesol, benzyl alcohol, benzyl benzoate, benzyl salicylate, benzyl cinnamate, and cinnamyl alcohol; aldehydes and ketones such as cinnamal, hydroxycitronellal, alpha-isomethyl ionone, coumarin, and hexyl cinnamal; phenolic compounds such as eugenol, isoeugenol, and methyl 2-octynoate; terpenes such as limonene and amyl cinnamal; and two natural extracts, oakmoss (Evernia prunastri) and tree moss (Evernia furfuracea), plus Peruvian balsam.
Several substances on the original list have since been fully banned rather than merely disclosure-required. Lilial, also known as butylphenyl methylpropional, was prohibited in the EU from 1 March 2022 as a category 1B reproductive toxicant under the CMR provisions of the Cosmetics Regulation. Lyral, hydroxyisohexyl 3-cyclohexene carboxaldehyde, was banned in finished products from August 2021 after years of restriction.
Expansion to 82 declarable allergens
Regulation 2023/1545 brings the total number of declarable fragrance substances on cosmetic labels to 82. The additions include a broad set of further natural extracts and synthetic compounds identified through updated SCCS opinions, ranging from menthol and carvone to acetylcedrene and salicylaldehyde. Some entries on the new list are extracts such as jasmine sambac absolute or lavandin oil, listed when their characteristic allergenic constituent exceeds the disclosure threshold (Official Journal of the European Union, Regulation 2023/1545, 2023).
The practical consequence for niche houses is a longer ingredient list under the perfume bottle's outer packaging. Brands have responded by reorganizing labels, sometimes printing the INCI declaration on a small fold-out leaflet attached to the box, and by reviewing every formula in the catalogue to verify which of the 82 substances cross the threshold and must be declared.
IFRA Standards vs EU regulation
Disclosure obligations under EU law and use-level restrictions under IFRA address different questions. EU disclosure tells the consumer that a known allergen is present so that a sensitized individual can avoid it. IFRA restrictions cap the concentration of certain ingredients across the entire industry to keep exposure below a safety threshold derived from RIFM toxicology studies. A substance may be unrestricted by IFRA but still subject to mandatory disclosure under EU law, or vice versa.
IFRA Standards are reorganized by amendment cycle, with the 49th Amendment in 2019 and the 51st Amendment in 2023 marking the most consequential recent revisions. The IFRA library is published openly at ifrafragrance.org, organized by ingredient and by product category. For perfumes specifically, category 4 covers leave-on products designed for skin application and sets the most relevant thresholds for niche compositions.
Impact on niche perfumery
The cumulative effect of IFRA amendments and EU disclosure rules since 2003 has driven extensive reformulation. Chypre and fougere structures, which historically relied on oakmoss for their damp, mossy base, were the most affected: atranol and chloroatranol, the allergenic constituents of oakmoss, are now severely restricted, effectively limiting the traditional Mousse de Chêne accord to trace levels in leave-on products. Mitsouko by Guerlain, Miss Dior, and Ma Griffe by Carven were all reformulated over the 2000s and 2010s for this reason.
A secondary effect has been a vintage market in pre-reformulation bottles, where collectors pay significant premiums for sealed flacons predating the restrictions. Niche houses have responded in varied ways: Caron and Guerlain have reformulated while attempting to preserve the spirit, Parfums de Nicolaï has publicly lamented the restrictions but complied, and a small number of artisan perfumers have tested oakmoss substitutes such as evernyl, with partial success in rebuilding the depth of classic chypre structures.
Reading an ingredient label
On a niche perfume box, the INCI ingredient declaration appears in small type, often on a fold-out leaflet for compositions with many declared substances. Each entry uses the INCI name, which can differ from the marketing name: parfum or fragrance covers the proprietary composition, alcohol denat. is the ethanol carrier, and the individual declarable allergens follow as separate line items.
For a consumer with a known sensitivity, scanning this list is the only reliable way to check a new fragrance before applying it. A patch test result from a dermatologist identifies the specific compound to avoid, and the INCI list shows whether that compound is present above threshold. For someone with no known sensitivity, the list serves as documentation rather than a warning, and the size of the list is not in itself a quality signal.
Sources
- European Commission, Cosmetic Products Regulation 1223/2009 and Annex III. Accessed 2026-05-29.
- Official Journal of the European Union, Commission Regulation (EU) 2023/1545, 26 July 2023.
- IFRA, Standards 51st Amendment, ifrafragrance.org. Accessed 2026-05-29.