The April 12 2026 List 1 Allergen Deadline Explained

April 12, 2026 is not a deadline you want to discover a week before it hits. That is the date List 1, the original fragrance allergen set, becomes mandatory on both the Cosmetic Notification Form and the product label in Canada. If your fragrance touches any essential oil, you almost certainly have at least one List 1 allergen in your formula right now, whether you have been declaring it or not.

What actually changes on April 12

Before this date, fragrance ingredients could largely sit behind the word "Parfum" without further breakdown. After it, any List 1 allergen present above the disclosure threshold has to be named individually, both on the CNF and on the label itself. This is not a soft recommendation. It is a hard requirement with a fixed date attached, and Health Canada is not going to extend it for makers who did not get around to checking their formulas.

Common List 1 allergens include Limonene, Linalool, Citronellol, Geraniol, Eugenol, and Coumarin. These are not obscure synthetic additives. They occur naturally in a huge range of essential oils, which means a formula built entirely around "natural" fragrance can still carry several of them at meaningful concentrations.

The thresholds that decide whether you need to disclose

Disclosure is triggered above 0.001% (10 ppm) in leave-on products and above 0.01% (100 ppm) in rinse-off products. Those thresholds are low. A leave-on lotion with even a modest essential oil load can clear the 10 ppm mark for one or more allergens without the formulator intending anything unusual.

The practical implication: you cannot eyeball this. You need to know the actual allergen composition of every essential oil and fragrance ingredient in your formula, at your actual use rate, and check each resulting concentration against the correct threshold for your product's category (leave-on or rinse-off).

Working through an example

Say you use a lavender essential oil at 1% in a leave-on body lotion. Lavender oil commonly carries Linalool as a significant natural constituent, often in a range that easily clears 10 ppm in the finished product at even a modest use rate. That means Linalool likely needs individual disclosure on both your CNF and your label starting April 12, even though your ingredient list currently might just say "Lavandula Angustifolia (Lavender) Oil" and "Parfum."

The exact percentage of any given allergen in a specific essential oil varies by source, harvest, and supplier, so do not assume a textbook percentage applies to your specific batch. Check your supplier's documentation, or test if you need certainty, rather than assuming.

What happens if you miss it

There is no ambiguity about the date itself: April 12, 2026 is when List 1 becomes mandatory, not a suggested target. A notification or a label that fails to disclose a required allergen after that date is out of compliance, the same as any other inaccurate or incomplete filing. The exposure is the same kind you'd face for any other labelling or notification gap, ranging from a request to correct and refile up to more serious enforcement attention if the gap is significant or repeated.

Given that List 2, an expanded allergen set aligned with international lists, follows on August 1, 2026, treating April 12 as a one-time scramble is also short-sighted. Whatever process you build to handle List 1 disclosure should be reusable for List 2 a few months later.

A simple pre-deadline checklist

Step	What to do
1	List every essential oil, absolute, and fragrance ingredient in every active formula
2	For each one, identify its known List 1 allergen constituents (Limonene, Linalool, Citronellol, Geraniol, Eugenol, Coumarin, and others on the full list)
3	Calculate each allergen's finished-product concentration at your actual use rate
4	Compare against the correct threshold for your product type, leave-on or rinse-off
5	Update your CNF and label artwork for anything above threshold, ahead of April 12

Don't wait for the second deadline to build the habit

If you are only now working through this for List 1, take the extra hour to build a repeatable process rather than a one-off fix, since List 2 is coming in August and will ask you to run the same exercise again with a longer allergen list. This is exactly the kind of repetitive, detail-heavy screening that Cosmetic Comply handles automatically, checking every mapped ingredient against the current allergen thresholds and Hotlist restrictions together, so you are not manually recalculating finished concentrations for every essential oil in every formula, twice, six months apart.