What New Allergens List 2 Adds in August 2026

Two deadlines, four months apart, and it's easy to conflate them if you're only half paying attention. List 1 becomes mandatory on the Cosmetic Notification Form and the label on April 12, 2026. List 2, the expanded set aligned with international lists, follows on August 1, 2026. If you've already done the work to comply with List 1, the smart move is figuring out exactly what List 2 adds on top of it, rather than re-auditing your entire formula library from scratch a second time.

Why this is being treated as two separate waves

Regulators phased this deliberately. List 1 represents the original, longer-established fragrance allergen set, the substances with the most existing recognition and testing history. List 2 broadens that set to align more closely with international allergen lists, which means it captures additional substances that have accumulated evidence of sensitization potential more recently, or that appear in international frameworks Canada is harmonizing toward.

For a maker, the practical benefit of the staggered rollout is that you get a real runway. You can get your List 1 disclosures correct, sell through existing List-1-only labeled inventory where applicable, and then turn to the incremental List 2 additions with nearly four months of lead time before the second deadline lands.

What "isolating the new ones" actually looks like

The names that recur constantly in fragrance allergen discussion, Limonene, Linalool, Citronellol, Geraniol, Eugenol, Coumarin, are generally part of the original, longer-established List 1 set. These are the ones most makers have already been tracking in some form because they're common constituents of everyday essential oils like citrus peel oils, lavender, and rose geranium.

List 2 is where the incremental, less universally-known additions live, the substances brought in specifically to align with broader international allergen frameworks. Because the exact composition of List 2 is a specific regulatory list rather than a general category, and because these lists get published and maintained directly by Health Canada, this is exactly the kind of detail you want to pull from the current official source rather than relying on a secondhand summary, including this one. Treat any specific List 2 substance name you see referenced elsewhere as a starting point for verification, not a final answer.

A practical audit approach that works regardless of the exact list

Rather than waiting to memorize every name on List 2, build a process that catches whatever the list actually contains:

1. Pull the current official List 1 and List 2 substance names directly from Health Canada's published guidance close to your filing date, since these frameworks can be refined between now and the deadlines.
2. Run every finished formula's fragrance and essential oil components against both lists, not just the ones you assume are risky. Constituents you don't expect are often the ones that get missed.
3. Recalculate concentration for each hit, remembering that a single allergen can enter a formula through more than one ingredient, an essential oil and a separate fragrance compound, for example, and contributions add together.
4. Compare against the correct threshold for your product type, above 0.001% (10 ppm) for leave-on products, above 0.01% (100 ppm) for rinse-off products.
5. File the amendment and update the label for any product where a new List 2 hit crosses the threshold, ideally before August 1, 2026 rather than at the deadline.

Why doing this in one pass, not two, saves real time

If you wait until List 1 is due, address only that, and then start from zero again for List 2 in the summer, you're essentially running the same ingredient-tracing exercise twice. Most of the labor, pulling supplier documentation, mapping trade names to INCI, calculating concentrations, is identical work regardless of which list you're screening against. Doing a single thorough allergen audit against both lists now, even though only List 1 is immediately mandatory, means the August deadline becomes a formality rather than a scramble.

Cosmetic Comply's screening checks ingredients against the relevant Hotlist and allergen thresholds with a confidence score and a human reviewer behind it, which makes it straightforward to run one combined pass covering both List 1 and List 2 obligations well ahead of either deadline, rather than treating them as two separate projects.