Allergen Documentation for Natural Cosmetic Ingredients

Natural fragrance materials are chemically complex. A rose oil, citrus oil or aromatic extract may contribute dozens of volatile constituents, including molecules that require restriction or individual label disclosure. An ingredient can be authentic, minimally processed and still present an allergy-management obligation. Documentation must connect the botanical batch to the finished cosmetic rather than stopping at a generic “natural” claim.

Retire the static “26 allergens” checklist

The phrase “EU 26 allergens” remains common in purchasing files, but it is no longer a sufficient regulatory model. When Commission Regulation (EU) 2023/1545 was adopted, the regulation described 24 fragrance allergens then subject to individual labelling and added many further substances while updating and grouping Annex III entries. The amendment preserves the familiar trigger levels: individual labelling above 0.001% in leave-on and 0.01% in rinse-off cosmetic products where the relevant entry applies.

The new requirements include transition periods: products complying with the previous rules may be placed on the EU market until 31 July 2026 and made available until 31 July 2028. A regulatory file should therefore identify which rule set and transition status apply to the actual product. A spreadsheet frozen around the historical 26-item shorthand can omit newly listed substances or use obsolete naming.

Map constituents inside natural complex substances

Essential oils are natural complex substances, not single fragrance chemicals. Limonene in citrus peel oil, linalool in lavender, citral in lemongrass and geraniol in rose are intrinsic constituents. Their percentages vary with species, chemotype, geography, harvest maturity, distillation and storage. Oxidation can also change sensitisation relevance even when the original oil met specification.

Begin with exact identity: INCI name, Latin binomial, plant part, extraction method and batch. A declaration for “citrus oil” cannot reliably represent expressed lemon peel oil and distilled bergamot oil. The supplier should state regulated constituents, their reported concentration or defensible maximum, the basis of the values and the document revision date.

Use GC-MS as evidence, not an automatic verdict

A batch-specific GC-MS chromatogram helps confirm identity and quantify important volatile constituents. It can reveal whether a declared chemotype and allergen profile fit the delivered material. Yet a peak table is not automatically a complete regulatory declaration. Co-elution, calibration approach, detection limit and an abbreviated reporting threshold can all affect what appears.

Ask whether the figures are measured on the batch, derived from representative data or stated as specification maxima. For non-volatile extracts, GC-MS may not be the appropriate method at all; the extraction solvent and analytical target determine the technique. The responsible assessor must connect the analytical evidence to the applicable Annex III names, including grouped substances where required.

Calculate contribution in the finished cosmetic

Raw-material concentration is only the first term. If an essential oil used at 0.30% contains 20% of a declarable constituent, its nominal contribution is 0.06% before considering the same constituent from other fragrance and botanical inputs. Contributions from every source must be aggregated and assessed against the rule for the finished product and its leave-on or rinse-off status.

Use conservative maxima where batch variation is meaningful, and preserve the calculation version that matches the formula. Reformulation, supplier change or a different essential-oil chemotype can change the ingredient list even when the product name remains unchanged.

Separate IFRA conformity from EU labelling

IFRA Standards manage safe fragrance use by product category and may restrict a natural complex substance because it contributes one or more restricted constituents. An IFRA certificate or conformity statement should identify the fragrance mixture, applicable amendment, product category and maximum use level. For a raw essential oil, compositional data and the relevant IFRA Standards remain necessary inputs.

This does not answer every cosmetic-law question. IFRA conformity is not an EU marketing authorisation, does not generate the ingredient list and does not replace the Cosmetic Product Safety Report. Conversely, printing an allergen on a label does not override an IFRA restriction. Both assessments must reach the same final formula through different routes.

Build an auditable documentation chain

For each aromatic natural ingredient, retain the specification, SDS, batch CoA, allergen declaration, relevant GC-MS data, IFRA information and change-control history. Record the supplier's methodology and revision date. Link those records to the finished-formula calculation, label decision and safety assessment within the Product Information File.

Set review triggers for a new origin, botanical species, extraction process, analytical profile, regulatory amendment or IFRA update. This chain turns a supplier statement into traceable evidence. It also makes the central point defensible: natural origin is a sourcing attribute, not an exemption from allergen control.