Fragrance (Parfum): The One INCI That Hides Many Allergens

Look at almost any cosmetic ingredient list and you'll spot it near the end: Parfum, or Fragrance in some markets. One word, doing the work of what might be forty or fifty individual aromatic compounds. It's the one place in an otherwise fully disclosed ingredient list where the actual contents stay hidden, and understanding why gets you most of the way to understanding the fragrance allergen rules.

Why one word gets to cover a whole blend

Fragrance formulas are treated as trade secrets in most regulatory frameworks, on the reasoning that a company's specific scent blend is proprietary the way a recipe or formula might be for any other product. Rather than forcing companies to disclose forty ingredient names (which would also functionally publish their fragrance formula for any competitor to copy), regulators allow "Parfum" or "Fragrance" as a single INCI entry that represents the whole blend.

This is completely different from how every other ingredient on a cosmetic label works. Aqua is water, full stop, no hidden blend behind it. Glycerin is glycerin. But Parfum could be practically anything the fragrance house decided to put in it, drawn from a palette of hundreds of possible aromatic compounds, and the consumer reading the label has no way to know which ones without additional disclosure.

Where the allergen rules step back in

This is exactly the gap fragrance allergen disclosure rules exist to close. Regulators identified a specific list of compounds, ones known to cause skin sensitization or allergic reactions in a meaningful share of the population, and require them to be named individually on the label once they're present above a certain concentration, even though they're technically part of the "Parfum" blend.

In Canada, this plays out in two stages. List 1, the original fragrance allergen set, becomes mandatory on both the Cosmetic Notification Form and the label on April 12, 2026. List 2, an expanded set aligned with international lists, becomes mandatory August 1, 2026. The disclosure triggers are concentration-based: above 0.001% (10 ppm) in leave-on products, and above 0.01% (100 ppm) in rinse-off products.

Common names that keep showing up

Some of the allergens that recur most often, largely because they occur naturally in a huge range of essential oils and are also common in synthetic fragrance compounds:

Allergen	Commonly found in
Limonene	Citrus oils, many synthetic fragrance blends
Linalool	Lavender, bergamot, many florals
Citronellol	Rose, geranium, citronella
Geraniol	Rose, geranium, palmarosa
Eugenol	Clove, rose, cinnamon
Coumarin	Tonka bean, lavender (trace), many synthetic fragrance bases

If your "Parfum" is built from a blend of natural essential oils, several of these are almost guaranteed to be present, since they're naturally occurring constituents of oils like lavender, rose, and citrus, not exotic additives someone chose to include.

What this means practically

Once the disclosure threshold is crossed, the allergen gets pulled out and listed on its own, separate from the Parfum entry, typically appearing on the ingredient list alongside the other named ingredients rather than staying folded inside the fragrance blend. Your label might read something like: Aqua, Glycerin, ... Parfum, Linalool, Limonene, Geraniol. The Parfum entry stays, and the individual allergens that crossed the threshold sit next to it, named plainly.

For makers who buy pre-made fragrance oils from a supplier rather than building their own scent blends, this means you need the supplier to actually disclose the allergen composition of their fragrance oil, not just sell it to you as an unlabeled proprietary blend. A responsible fragrance supplier will provide an allergen declaration alongside the fragrance oil, breaking out which of the recognized allergens are present and at roughly what concentration in their blend. Without that, you have no way to calculate whether your finished product crosses the disclosure threshold.

The calculation still matters

Knowing which allergens are in your fragrance blend is only half of it. You still need to calculate their actual concentration in your finished product, which means taking the percentage the allergen represents within the fragrance oil and multiplying it by how much of that fragrance oil you're using in your formula. A fragrance oil used at 1% that's 5% linalool contributes 0.05% linalool to your finished product, comfortably above the leave-on threshold and needing individual disclosure.

Where this tends to go wrong

The most common failure point isn't ignorance that Parfum can hide allergens, most makers who've been in the industry a while know that in general terms. It's not having supplier documentation detailed enough to do the actual math, and defaulting to leaving the fragrance blend as one line item because breaking it apart feels like more work than it's worth, until the mandatory dates arrive and it becomes unavoidable.

This is a good chunk of what Cosmetic Comply handles under the hood: taking your fragrance ingredient (whether it's a single essential oil or a supplier's proprietary blend with allergen documentation attached), expanding it against known allergen content, and calculating whether each allergen crosses the disclosure threshold at your specific use level, so Parfum on your label doesn't become a compliance blind spot once the mandatory dates hit.