The EU is expanding mandatory fragrance allergen labeling from 24 entries (commonly called “the 26”) to approximately 82 substances and substance groups under Commission Regulation (EU) 2023/1545. New products placed on the EU market after 31 July 2026 must individually disclose every allergen above 0.001% in leave-on or 0.01% in rinse-off products, including allergens naturally present in essential oils.
For formulators, the practical translation is bigger than a label change. Many existing ingredients could now potentially trigger three to seven declarable allergens at once. This is directly caused by allergens that are by-products from oxidation. These are now treated as equivalent to the parent allergens, and a single new “natural fragrance accord” can blow past every threshold on the page.
This is the side-by-side guide your team needs to compare both lists, recognize where formulas are at risk, and decide between reformulation and re-labeling, before customs detentions and Safety Gate alerts begin.
What changed under Regulation (EU) 2023/1545?
Regulation (EU) 2023/1545 was published in the Official Journal of the European Union on 27 July 2023 to amend Annex III of the EU Cosmetics Regulation (EC) No 1223/2009 as regards labelling of fragrance allergens in cosmetic products. It represents the most significant change to fragrance allergen labelling in roughly two decades and is now further refined by a 2025 Corrigendum, which corrects the INCI for Rose ketone 4 (now “Rose ketone 4 (Damascenone)”), broadens the Pelargonium graveolens entry to cover additional oil fractions, and adds Pogostemon cablin leaf oil as a declarable allergen.
At a Glance: The amendment also introduces three structural changes that matter for formulators:
- Grouping related substances into combined entries to streamline labelling. Example: geranial and neral are now declared under the single INCI “CITRAL”.
- Fixing the exact INCI name to be used when a substance has multiple common names, making legacy synonyms on existing labels non‑compliant even if the underlying chemistry is unchanged.
- Treating prehaptens and prohaptens as equivalent to their activated parent allergens, so oxidation‑derived by‑products carry the same regulatory weight for labelling and safety assessment.
The original 26 — every allergen on the legacy Annex III list
Here is the legacy list that has been in force since 2003 and updated through 2012 SCCS opinions. Note that HICC (Lyral) was banned outright in the EU in 2021, leaving the “26” effectively at 24 entries. The list below reflects what is still permitted today, grouped for formulator readability:
Aldehydes (cinnamal & relatives)
| INCI Name | Common Source / Notes |
| Amyl cinnamal | Synthetic; floral notes |
| Amylcinnamyl alcohol | Synthetic; jasmine accord |
| Cinnamal | Cinnamon, cassia oils |
| Cinnamyl alcohol | Cinnamon, balsam, hyacinth |
| Hexyl cinnamal | Synthetic; jasmine note |
| Hydroxycitronellal | Synthetic; lily-of-the-valley note |
Phenolics
| INCI Name | Common Source / Notes |
| Eugenol | Clove bud oil, basil, bay |
| Isoeugenol | Ylang-ylang, clove, nutmeg |
| Anise alcohol | Anise, fennel |
| Benzyl alcohol | Jasmine, ylang-ylang, broad use |
| Benzyl salicylate | Ylang-ylang, carnation, sunscreen UV-A absorber |
| Benzyl benzoate | Tolu balsam, ylang-ylang |
| Benzyl cinnamate | Storax, balsams |
| Coumarin | Tonka bean, lavender absolute |
Terpenes and Terpenoids
| INCI Name | Common Source / Notes |
| Citral | Grouped name for geranial + neral; lemongrass, lemon |
| Citronellol | Geranium, rose oils |
| Geraniol | Rose, palmarosa, citronella |
| Farnesol | Floral oils, broadly used |
| Limonene | D-limonene in citrus oils (orange, lemon, bergamot) |
| Linalool | Lavender, rosewood, coriander, basil |
| Alpha-isomethyl ionone | Synthetic; violet/iris note |
Other
| INCI Name | Common Source / Notes |
| Methyl 2-octynoate | Synthetic; green/violet leaf accord |
| Evernia prunastri extract | Oakmoss absolute — heavy fougère / chypre use |
| Evernia furfuracea extract | Treemoss absolute |
Source: SGS Hong Kong summary of the 2023 amendment with cross-reference to Annex III “Current” entries.
The 56+ new allergens added by Regulation (EU) 2023/1545
The amendment adds approximately 56 additional fragrance allergens — a mix of synthetic molecules, natural extracts and essential oils, and prehapten/prohapten compounds. Below is the full list, organized by category for formulator decision-making, validated against the SGS summary and the 2025 Corrigendum updates.
New synthetic allergens
| INCI Name | Why It Matters to Formulators |
| 6-Methyl coumarin | Coumarin analog; wider use in floral accords |
| Acetyl cedrene | Synthetic woody; common in masculine and unisex EDPs |
| Amyl salicylate | Floral; broad sunscreen and perfume use |
| Anethole | Anise/licorice note; replaces many natural anise applications |
| Benzaldehyde | Almond accord; widely used in cherry/almond compositions |
| Beta-caryophyllene | Spicy/woody; clove, black pepper, copaiba |
| Camphor | Pungent/cooling; sports/therapeutic categories |
| Carvone | Spearmint, caraway; oral care and gum-flavored accords |
| Dimethyl phenethyl acetate | Synthetic floral; rose/honey accord |
| Eugenyl acetate | Ester of eugenol; equivalent regulatory treatment |
| Geranyl acetate | Ester of geraniol; widely used in rose accords |
| Hexadecanolactone | Synthetic musk replacement |
| Hexamethylindanopyran | Polycyclic musk family |
| Isoeugenyl acetate | Ester of isoeugenol |
| Linalyl acetate | Lavender oil constituent; one of the most common naturals impacts |
| Menthol | Cooling; oral care, skin care, sports recovery |
| Methyl salicylate | Wintergreen note; sports topicals and oral care |
| Pinene (alpha and beta) | Pine, conifer notes |
| Rose ketone 4 (Damascenone) | Rose, blackcurrant, fruity florals (per 2025 Corrigendum) |
| Salicylaldehyde | Almond/floral; precursor to coumarin |
| Santalol | Synthetic sandalwood analog |
| Sclareol | Clary sage diterpene; used in many ambers |
| Terpineol | Pine and lilac notes |
| Tetramethyl acetyloctahydronaphthalenes | Synthetic woody amber |
| Trimethylbenzenepropanol | Synthetic; floral/woody |
| Trimethylcyclopentenyl methylisopentenol | Synthetic floral |
| Vanillin | Vanilla note; gourmand category core ingredient |
| 3-Propylidenephthalide | Celery, lovage |
| Alpha-terpinene | Tea tree, eucalyptus by-product (prehapten) |
| Terpinolene | Tea tree, conifer (prehapten) |
New natural extracts and essential oils
These additions are the most consequential for natural and clean-beauty brands. Each entry below is now declarable when present above threshold, even when used as a single essential oil or when the allergens within it are not separately measured.
| INCI Name | Common Use |
| Cananga odorata oil/extract | Ylang-ylang (cananga) — floral |
| Cedrus atlantica oil/extract | Atlas cedar — woody base |
| Cinnamomum cassia leaf oil | Cassia — spice notes |
| Cinnamomum zeylanicum bark oil | True cinnamon |
| Citrus aurantium flower oil | Neroli — high-end florals |
| Citrus aurantium peel oil | Bitter orange — citrus tops |
| Citrus aurantium bergamia peel oil | Bergamot — fougère and Earl Grey accord |
| Citrus limon peel oil | Lemon peel oil |
| Eucalyptus globulus oil | Eucalyptus — therapeutic/cooling |
| Eugenia caryophyllus oil | Clove — warm spice |
| Jasmine oil/extract | Jasmine — floral heart notes |
| Juniperus virginiana oil | Virginia cedarwood |
| Laurus nobilis leaf oil | Bay laurel — barbershop fougère |
| Lavandula oil/extract | Lavender — most widely used essential oil globally |
| Lemongrass oil | High citral source |
| Lippia citriodora absolute | Verbena |
| Mentha piperita oil | Peppermint |
| Mentha viridis leaf oil | Spearmint |
| Myroxylon pereirae oil/extract | Peru balsam — heavy allergen risk |
| Narcissus extract | Narcissus absolute — high-end florals |
| Pelargonium graveolens oil/flower oil/leaf oil | Geranium — corrected scope (2025 Corrigendum) |
| Pinus mugo | Mountain pine |
| Pinus pumila | Dwarf pine |
| Pogostemon cablin oil + leaf oil | Patchouli — added in 2025 Corrigendum |
| Rose flower oil/extract | Rose otto, rose absolute |
| Santalum album oil | True Mysore sandalwood |
| Turpentine (gum, oil) | Pine resin extracts |
This list is not exhaustive of every natural ingredient affected, it is the list of new entries on Annex III. A natural oil not named here can still generate declarable allergens through its constituent chemistry (e.g., linalool from rosewood oil, citronellol from rose oils, eugenol from basil).
Do essential oils trigger multiple allergens at once?
Yes, and this is the single biggest formulation trap. A single essential oil can carry three to seven (sometimes more) declarable allergens above threshold even at modest use levels. Below are representative ranges based on published essential oil composition data (actual concentrations vary by origin, harvest, distillation, and supplier specifications, always verify with current supplier COA):
| Essential Oil | Typical Declarable Allergens Inside |
| Lavandula angustifolia (Lavender) oil | Linalool (25–45%), Linalyl acetate (25–45%), Limonene, Geraniol, Coumarin (trace), Caryophyllene |
| Citrus aurantium bergamia (Bergamot) peel oil | Limonene (30–50%), Linalool (5–15%), Linalyl acetate (15–30%), Citral (trace), Geraniol (trace) |
| Citrus limon (Lemon) peel oil | Limonene (60–75%), Citral, Beta-pinene, Alpha-pinene, Geraniol (trace) |
| Rose otto (Rosa damascena flower oil) | Citronellol (15–35%), Geraniol (10–25%), Linalool, Eugenol (trace), Farnesol |
| Ylang-ylang (Cananga odorata) | Benzyl benzoate, Benzyl salicylate, Linalool, Geraniol, Farnesol, Isoeugenol (trace) |
| Peppermint (Mentha piperita) | Menthol (35–55%), Carvone (trace), Limonene, Linalool |
| Tea tree (Melaleuca alternifolia) | Alpha-terpinene, Terpinolene, Limonene, Linalool — all prehaptens |
| Eucalyptus globulus | Alpha-pinene, Beta-pinene, Limonene, Terpineol |
| Clove bud (Eugenia caryophyllus) | Eugenol (70–85%), Eugenyl acetate, Beta-caryophyllene |
| Patchouli (Pogostemon cablin) | Beta-caryophyllene, Limonene |
| Peru balsam (Myroxylon pereirae) | Cinnamyl alcohol, Cinnamal, Benzyl benzoate, Benzyl cinnamate, Vanillin |
The practical math is unforgiving. A 0.5% use level of bergamot oil in a leave-on cream can put limonene, linalool, and linalyl acetate all above the 0.001% threshold simultaneously, meaning each one must appear by name in the ingredients list, regardless of the fact that all three came from one ingredient.
What are prehaptens and prohaptens, and why are they now regulated?
A hapten is a small molecule that can bind to a skin protein and trigger an allergic response. A prehapten is a substance that is not itself a strong allergen but becomes one through air oxidation outside the skin (autoxidation, photoactivation). A prohapten becomes an allergen after entering the skin, where enzymes, primarily cytochrome P450s, convert it into a sensitizing form.
Under the previous regime, these activated forms fell into a regulatory gray zone. Under Regulation (EU) 2023/1545, prehaptens and prohaptens are now treated as equivalent to their activated allergens, meaning the parent substance is subject to the same labeling threshold and the same enforcement consequences.
For formulators, four substances deserve the most attention:
| Substance | Mechanism | What It Becomes | Formulation Implication |
| Limonene | Air oxidation (prehapten) | Limonene hydroperoxides | Major issue for citrus-heavy formulas; antioxidants and inert packaging can slow but not stop oxidation |
| Linalool | Air oxidation (prehapten) | Linalool hydroperoxides | Lavender, rosewood, basil-containing formulas need stability strategies |
| Geraniol | Both pathways | Geranial + epoxygeraniol | Rose, palmarosa, citronella oils; activation cannot be fully prevented |
| Alpha-terpinene | Both pathways | Conjugated epoxides | Tea tree oil at risk; antioxidant strategies have limits |
| Eugenol / Isoeugenol | Bioactivation (prohapten) | Quinone methide | Clove, ylang-ylang formulas |
| Cinnamyl alcohol | Both pathways | Cinnamal | Cinnamon, balsam formulas |
For the regulatory file, this means a CPSR must include a safety-assessor view of oxidation potential, antioxidant strategy, packaging selection, and shelf-life impact, not just the pure-substance toxicology.
Is “natural” exempt from EU allergen labeling?
No. The EU treats naturally occurring allergens exactly the same as synthetic allergens. There is no “essential oil exemption,” “naturally derived” exemption, or “clean beauty” exemption. The same 0.001% / 0.01% thresholds apply.
This is the single most common misconception we hear from clean-beauty and indie-brand founders. A product can be:
- 100% natural
- 100% organic
- 100% essential-oil-derived
…and still require every individual allergen above threshold to be declared by exact INCI name. The Annex III obligation attaches to the chemical present in the finished product, not to the source of that chemical.
The implication for natural and clean brands is that the 82-allergen list disproportionately impacts you, because natural essential oils typically contain multiple declarable allergens by design.
Can formulators still use fragrance after 2026?
Yes. The regulation does not prohibit any of the 82 substances. It requires transparent labeling above threshold. Brands have three viable strategic responses:
Strategy 1 — Re-label and disclose
Keep the formula. Update the artwork. List every declared allergen by exact Annex III INCI name. This is appropriate when the existing fragrance is integral to brand identity and the declared list is acceptable from a consumer standpoint.
Pros: Lowest cost. Fastest. Preserves the scent the brand was built on.
Cons: Long ingredient declarations; some markets perceive long allergen lists as a “warning flag.”
Strategy 2 — Reformulate down
Reduce the use level of high-allergen ingredients to fall below threshold (under 0.001% for leave-on, 0.01% for rinse-off). This means smaller doses of bergamot, lavender, ylang-ylang, etc.
Pros: Avoids label expansion.
Cons: Scent strength and brand identity may suffer. Re-stability and re-CPSR work required. Threshold math is tight at typical use levels.
Strategy 3 — Reformulate out
Substitute high-allergen naturals with lower-allergen alternatives — synthetic captives, isolates that do not contain Annex III substances, allergen-free fragrance oils marketed by major houses (e.g., Givaudan, Symrise, dsm-firmenich, IFF have all launched 2026-ready palettes).
Pros: Cleanest label. Strongest “no compromise” positioning.
Cons: Highest reformulation cost. May require sensory re-design. Sourcing risk.
A pragmatic 2026 portfolio strategy often blends all three across the SKU range, re-label hero SKUs, reformulate-down mid-tier, reformulate-out anywhere the original allergen load was already a known dermatology risk.
Free EU Allergen Compliance Review — what you get
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Frequently asked questions
How many fragrance allergens does the EU require on cosmetic labels in 2026?
Approximately 82 individually labeled allergens. The original 24 entries (commonly referenced as “the 26”) plus 56–57 additional entries added by Commission Regulation (EU) 2023/1545 and refined by its 2025 Corrigendum.
Do essential oils have to be labeled for allergens?
Yes. Every allergen present above the 0.001% leave-on or 0.01% rinse-off threshold must be declared on the label by exact Annex III INCI name, regardless of whether it came from a synthetic captive or a naturally distilled essential oil.
What is the difference between a prehapten and a prohapten?
A prehapten is converted into an allergen outside the skin (typically by air oxidation). A prohapten is converted into an allergen inside the skin (typically by enzymatic catalysis via cytochrome P450). Both are now treated as equivalent to their activated allergens under Regulation (EU) 2023/1545.
Will the EU allergen rules apply in the UK after 2026?
Northern Ireland — yes, fully aligned through the Windsor Framework. Great Britain — not yet. GB has retained the original 26-allergen list, which creates dual-label complexity for brands selling into both EU and GB markets. The extended list is still under review.
Are 100% natural cosmetics exempt from the 82-allergen rule?
No. There is no natural, organic, or clean-beauty exemption. The threshold applies to the chemistry present in the finished product, not the source of that chemistry.
Can I keep using lavender oil after July 2026?
Yes — but you must declare each lavender-derived allergen above threshold. Lavender oil typically generates declarations for linalool and linalyl acetate at common use levels, often also limonene, geraniol, and coumarin (trace). Linalool and linalyl acetate are also prehaptens — the CPSR must address oxidation strategy.
How long does it take to update a CPSR for the 82-allergen rule?
Typically 2–4 weeks per SKU once updated supplier allergen data is in hand. Without clean supplier data, the cycle stretches to 6–10 weeks because allergen content must often be confirmed through ISO 17025 lab testing.
Closing — the formulator’s bottom line
The EU is not banning fragrance. It is forcing transparency at the molecule level — and naming each allergen by exact INCI in a way that holds suppliers, brands, and safety assessors accountable for the chemistry they put on skin.
For formulators, this is a portfolio-level event, not a SKU-level fix. The brands that come through 2026 cleanly will have:
- A complete supplier allergen dataset
- Per-SKU strategic decisions made (re-label, reformulate down, reformulate out)
- Refreshed CPSRs and PIFs with toxicologist sign-off
- Updated artwork using exact Annex III INCI names
- Re-notified CPNP records before 31 July 2026
Brands that delay risk customs detentions, Safety Gate alerts, recalls, and a public regulatory record their retail partners will see.
Registrar Corp and Personal Care Regulatory (PCR) deliver an integrated EU allergen compliance service for cosmetic brands — supplier allergen data review, CPSR updates with toxicologist sign-off, PIF refresh, artwork and CPNP updates, and EU/UK Responsible Person services.
⏱️ Reformulation cycles don’t wait.
Book your Free EU Allergen Compliance Assessment today. → [Get Your Free Assessment]
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