The essentials
A declarable allergen in EU cosmetics law is a fragrance material that the Scientific Committee on Consumer Safety (SCCS) has identified as carrying documented contact sensitization potential. When such a material is present in a finished cosmetic above a fixed threshold concentration, the manufacturer must declare it by its INCI name in the ingredients list printed on the packaging. The framework is anchored in the EU Cosmetics Regulation EC 1223/2009 and updated periodically as new scientific opinions are issued (European Commission, accessed 2026-05-29).
Two threshold concentrations apply in parallel. For leave-on products such as fine fragrances, body lotions, and creams, declaration is required at 0.001 percent (10 ppm) and above. For rinse-off products such as shower gels and shampoos, the threshold rises to 0.01 percent (100 ppm), reflecting shorter skin contact time. A fine fragrance carries a much higher fragrance load than a shower gel, so the lower leave-on threshold is the operative reference for niche perfumery.
The original list ran to 26 declarable allergens when it entered force in 2005 (Directive 2003/15/EC). A 2023 revision adopted by the European Commission expanded the list to 82 compounds, the most significant update since the system was introduced. The expansion is being phased in through staggered compliance deadlines that run into 2026 and 2028 depending on whether the product is new or already on the market (SCCS Opinion SCCS/1459/11 and 2023 amendment, accessed 2026-05-29).
The 10 ppm and 100 ppm thresholds
The two thresholds sit on a simple logic: the longer a substance stays on skin, the lower the concentration at which declaration is justified. Leave-on cosmetics include perfumes (extrait, eau de parfum, eau de toilette, eau de cologne) where the fragrance can stay in contact for hours; rinse-off cosmetics include shower products where contact is brief and the surfactant matrix limits skin penetration. Setting one threshold ten times stricter than the other reflects this exposure differential.
Below the threshold, no labeling is required even if the allergen is present. Above the threshold, the INCI name must appear in the ingredients list. The threshold applies per individual allergen, not per category, so a formula can contain ten declarable allergens each below 10 ppm without triggering any label declaration, while a formula with a single allergen at 15 ppm requires that one declaration.
From 26 allergens in 2003 to 82 in 2023
The original 26 declarable allergens were named in Directive 2003/15/EC, which amended the EU Cosmetics Directive and applied from March 2005. The list included familiar materials such as linalool, citronellol, geraniol, eugenol, isoeugenol, coumarin, citral, farnesol, oakmoss absolute, treemoss absolute, hydroxycitronellal, and Lyral (HICC). Their selection followed the 1999 SCCNFP opinion that flagged these compounds as documented contact sensitizers in clinical practice.
The 2023 expansion to 82 allergens added compounds identified by subsequent SCCS opinions, including several oxidation products such as oxidized limonene and oxidized linalool, additional terpenes, and natural extracts whose specific chemistry warranted distinct declaration. The transitional period gives manufacturers time to redesign labels and, in some cases, reformulate to stay below declaration thresholds where commercially preferred (Cosmetics Europe technical briefings, accessed 2026-05-29).
The role of SCCS scientific opinions
The Scientific Committee on Consumer Safety (SCCS) is an independent panel of toxicologists, dermatologists, and chemists convened by the European Commission to assess the safety of cosmetic ingredients. The SCCS reviews published toxicology and clinical contact-dermatitis data, weighs the evidence, and issues formal opinions that inform regulatory action. The committee does not make law itself; it advises the Commission, which then proposes amendments to the regulation.
For fragrance allergens, key SCCS opinions include the 1999 SCCNFP opinion that established the original 26-allergen list and the 2011 opinion SCCS/1459/11 that proposed the expansion eventually adopted in 2023. These documents are publicly available on the European Commission scientific committees portal and represent the scientific backbone of the labeling system.
How IFRA standards relate to EU labeling
IFRA and the EU Cosmetics Regulation pursue overlapping but distinct objectives. The EU framework focuses on consumer information through labeling, putting the wearer in a position to identify allergens they have already reacted to. IFRA standards focus on maximum use levels of restricted materials and are designed to manage population-level sensitization risk through formulation discipline rather than labeling.
In practice the two systems converge on similar materials but address them differently. A material like atranol or chloroatranol, both components of oakmoss, is prohibited entirely under IFRA Standard 49 (banned in any leave-on cosmetic) because of severe sensitization potential, while related materials with lower potency are restricted by IFRA to certain levels and additionally listed as declarable allergens in the EU labeling regime (IFRA Standards Library, accessed 2026-05-29).
What the label looks like for the wearer
On a niche perfume box, the ingredients list typically begins with Alcohol Denat., Parfum (Fragrance), Aqua/Water, followed by the declarable allergens that exceed threshold, listed by INCI name in descending order of concentration. A typical fine fragrance label may carry between five and fifteen named allergens depending on composition. Common entries include Linalool, Limonene, Citronellol, Geraniol, Coumarin, Benzyl Benzoate, and Eugenol.
The wearer is not expected to interpret these names as toxicity warnings. The declaration is informational, intended primarily for people with diagnosed contact dermatitis who track which materials they react to. For the general consumer, declared allergens carry no inherent safety implication beyond the threshold disclosure they enable.
What declaration changes for niche perfumers
The 2023 expansion to 82 allergens has meaningful operational consequences for niche houses. Smaller producers must update labels across their entire catalog, often working with regulatory consultants to verify ingredient-level data from suppliers. The longer label can also create marketing friction in a category where the visual restraint of the box is part of the product identity, leading some houses to redesign packaging to accommodate the expanded list legibly.
Some niche perfumers respond by reformulating slightly to bring borderline allergens below threshold, particularly when the material was used at concentrations just above 10 ppm for character rather than as a structural anchor. Others maintain the original formula and accept the expanded label as a transparency feature consistent with niche values of disclosure and traceability.
Sources
- European Commission, Cosmetics Regulation EC 1223/2009 and 2023 amendment expanding declarable allergens to 82. Accessed 2026-05-29.
- Scientific Committee on Consumer Safety, Opinion SCCS/1459/11 on fragrance allergens in cosmetic products, 2011.
- IFRA, IFRA Standards Library and position on fragrance allergens, www.ifrafragrance.org. Accessed 2026-05-29.
- Cosmetics Europe, Technical briefings on the 2023 allergen labeling update, industry guidance. Accessed 2026-05-29.