Fragrance Allergens Explained
Updated August 2026 · Reflects the Regulation (EU) 2023/1545 phase-in dates and FDA’s 2026 rulemaking agenda
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A fragrance allergen is a compound — natural or synthetic — that can cause skin sensitization in a small percentage of people under specific exposure conditions. Listing one is a statement about chemistry, not about danger: what matters is dose and exposure, not whether a name appears on a certificate. EU cosmetic labels must name 26 fragrance allergens today, and Regulation (EU) 2023/1545 expands that list to more than 80 as it phases in through 2028. |
A lavender field in bloom — the linalool that gives lavender its scent is a declarable EU fragrance allergen, natural origin or not. |
Key Takeaways
- An allergen listing describes chemistry, not danger. Impact depends entirely on dose and exposure, not on whether the compound appears in documentation.
- EU cosmetic labels must declare 26 named fragrance allergens today. Regulation (EU) 2023/1545 expands that list to more than 80 entries, applying to new products from 31 July 2026 and to all products on the EU market by 31 July 2028.
- Most fragrance allergens are naturally occurring — a 100% natural essential oil can contain 10+ of them.
- Disclosure thresholds are 0.001% (10 ppm) in leave-on products and 0.01% (100 ppm) in rinse-off products. Home fragrance generally carries no disclosure requirement, but IFRA category limits still apply.
What Is a Fragrance Allergen?
A fragrance allergen is a naturally occurring or synthetic chemical compound that can cause skin sensitization in a small percentage of the population under specific exposure conditions. Importantly, allergens are not dangerous by default—their impact depends entirely on dose and exposure.
Key point: Many allergens are naturally present in essential oils. For example:
- Limonene in citrus oils
- Linalool in lavender
- Eugenol in clove
- Citral in lemongrass
This means a product can be labeled “natural” and still contain allergens. The presence of allergens has nothing to do with product cleanliness or toxicity—it reflects naturally occurring chemistry.
How Do U.S. and EU Allergen Rules Differ?
United States
Under MoCRA (Modernization of Cosmetics Regulation Act), the FDA is required to establish fragrance allergen disclosure rules — but no proposed rule has been published as of August 2026, and the FDA’s 2026 regulatory agenda targets November 2026 for the proposal. Today, allergens do not need to be listed individually—they may appear under “Fragrance” or “Parfum.” State law is moving ahead of the FDA: California’s AB 496 bans Lilial (butylphenyl methylpropional), one of the EU’s named fragrance allergens, from cosmetics sold in the state from January 1, 2027.
European Union
The EU requires allergens to be listed individually on cosmetic packaging above certain thresholds:
| Threshold | Product Type |
|---|---|
| 0.001% (10 ppm) | for leave-on products like lotion or perfume |
| 0.01% (100 ppm) | for rinse-off products like soap and shampoo |
How Many Allergens Must EU Labels Name?
The EU’s allergen list has two layers. The original list of 26 named fragrance allergens is what cosmetic labels must declare today; two of those, Lilial (butylphenyl methylpropional) and HICC (Lyral), have since been banned from EU cosmetics outright, leaving 24 in active use. Regulation (EU) 2023/1545, in force since August 2023, expands the list to more than 80 entries, adding both individual chemicals and named plant extracts. That expansion is not yet in force for every product: new products placed on the EU market must comply from 31 July 2026, and products already on the market must comply, or be withdrawn, by 31 July 2028. Great Britain has not adopted the expansion — labels there still require only the original 26 (as of August 2026).
| When | What EU cosmetic labels must declare |
|---|---|
| Today | The original list of 26 named allergens (24 of which are still permitted in cosmetics), wherever they exceed 0.001% leave-on or 0.01% rinse-off. |
| From 31 July 2026 | The expanded list of 80+ entries applies to new products placed on the EU market. |
| From 31 July 2028 | The expanded list applies to all products made available on the EU market; non-compliant stock must be withdrawn. |
On EU labels today
26
named fragrance allergens. Phasing in to
80+
entries under Regulation (EU) 2023/1545 — including many essential oils and natural extracts — complete by 31 July 2028.
The two compliance dates and the full side-by-side rules for both markets are set out in our U.S. vs. EU perfume labeling comparison.
Why Do Allergens Appear on an IFRA 51 Regulatory Data Sheet?
IFRA regulates exposure—how much fragrance comes into contact with skin based on product type.
An allergen appears on an IFRA 51 Regulatory Data Sheet when:
- It is in the formula (naturally or intentionally)
- Its concentration is above trace levels
- Its presence affects the maximum allowable usage rate for certain categories
Because Stock Fragrance analyzes every formula at the ingredient level—including natural materials broken down into their individual chemical components—our documentation is extremely transparent compared to supplier summaries.
Are Natural Fragrances Allergen-Free?
A common misconception is that allergens are a “synthetic problem.” In reality, most allergens come from natural plant materials.
- Lavender contains linalool + linalyl acetate
- Roses contain citronellol and geraniol
- Citrus oils contain limonene + citral
- Ylang-ylang contains benzyl benzoate
Fragrance allergens grow on trees — the limonene and citral in citrus peel oil are natural constituents, not additives.
Fact: A 100% natural essential oil can contain 10+ allergens—even though it's completely natural.
Does an Allergen Listing Mean a Product Is Unsafe?
Regulators and toxicologists distinguish between:
- Hazard: The inherent properties of a substance.
- Exposure: How much of it you actually come into contact with.
Saying something is an allergen is not the same as saying it is unsafe.
Example:
- Peeling an orange exposes you to more limonene than most perfumes.
- Walking past a jasmine bush exposes you to more benzyl acetate than many lotions.
What About “Hypoallergenic” Fragrances?
Hypoallergenic fragrances avoid common allergens entirely. This requires removing or avoiding many natural materials, since plant-based ingredients naturally contain allergens.
Stock Fragrance offers both:
Each serves different needs depending on the product and regulatory goals.
Which Products Require Allergen Labeling?
If your brand sells cosmetics, skincare, haircare, deodorants, or any leave-on product, allergen labeling may apply based on your market.
For home fragrance categories (candles, diffusers, room sprays, etc.), allergen disclosure is typically not required—but IFRA category limits still apply.
Using allergen data in development
Use allergen data to:
- Understand your formula’s IFRA limits
- Check compliance for your product type
- Make strategic choices around natural vs. hypoallergenic concepts
To turn a compliance limit into a working formula, our fragrance oil calculator converts a target usage percentage into the fragrance weight a batch needs.
What Allergen Documentation Does Stock Fragrance Provide?
Our documentation includes:
- Full IFRA 51 Regulatory Data Sheets
- Detailed SDS with mixture-level analysis
- Allergen reporting based on EU and IFRA frameworks
- Full transparency of naturally occurring constituents
This makes Stock Fragrance a reliable, professional-grade source for brands, manufacturers, and product developers.
Related reading
More background on standards, documentation and formulation sits in our fragrance oil knowledge center. To smell the range before committing to a formula, the Discovery Set ships scented blotters covering the current collection.
Contact us with questions about allergens, IFRA, or regulatory requirements.
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