A Small Batch Maker's Workflow for Allergen Labeling

If you're running a one or two person operation, allergen labeling can feel like the thing that finally requires hiring someone. It doesn't, if you build it into your process once and reuse it every time you formulate. Here's the workflow I'd set up if I were making candles, soaps, or lotions out of my kitchen tomorrow.

Step one: know your triggers before you formulate

In Canada, fragrance allergen disclosure has two thresholds depending on how the product is used. Above 0.001 percent, which is 10 ppm, in a leave-on product like a lotion or a leave-in conditioner, an allergen needs to be disclosed. Above 0.01 percent, which is 100 ppm, in a rinse-off product like a soap or shampoo, the same applies. Those numbers are small. A fraction of a percent of an essential oil in your blend can clear that bar easily, especially in a leave-on product.

Common allergens to watch for include Limonene, Linalool, Citronellol, Geraniol, and Eugenol, along with Coumarin. These aren't obscure synthetic additives, they occur naturally in a huge range of essential oils, so "I only use essential oils, not synthetic fragrance" doesn't get you out of this.

Step two: build an ingredient card for every fragrance component

For every essential oil or fragrance blend you use, create a simple record with:

• The supplier's own allergen breakdown or safety data sheet, if they provide one.
• The INCI names of any allergens present.
• The percentage of the essential oil or blend in your total formula.
• The calculated final percentage of each allergen once you've multiplied it through.

This is the step people skip, and it's the one that actually determines whether you're above or below a disclosure threshold. If your lavender essential oil is 2 percent of your finished lotion, and that oil is documented at roughly 1 percent linalool, your final linalool concentration is about 0.02 percent, which clears the leave-on threshold and needs disclosure.

Step three: know your compliance dates

Canada's fragrance allergen disclosure comes in two phases. List 1, the original set of fragrance allergens, becomes mandatory on 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. If you're formulating now, build your workflow around List 2 from the start, so you're not redoing label art twice in one year.

A repeatable checklist

1. Pull the allergen data sheet for every fragrance ingredient before you finalize a formula, not after.
2. Calculate final concentrations for each allergen present, accounting for your full use rate.
3. Flag anything crossing 0.001 percent (leave-on) or 0.01 percent (rinse-off).
4. Add flagged allergens to your CNF filing and your label artwork at the same time, so they never drift out of sync.
5. Re-run this whole process any time you change fragrance supplier, blend ratio, or essential oil source, since a "same scent, different supplier" swap can change your allergen profile without you noticing.

Where this goes on the label versus the filing

Task	Where It Lives	When to Update
Allergen calculation	Your internal formula record	Every formulation or resupply
Allergen disclosure	Cosmetic Notification Form	Before first sale, amended on formula change
Allergen listing	Product label	Matches the CNF, updated together

The habit that actually saves you

The single highest-leverage habit is doing the allergen math at formulation time, in the same sitting where you're calculating your total formula percentages, rather than treating it as a separate compliance chore you do right before filing. If you build the allergen card into your standard formula sheet, by the time you're ready to notify, the numbers are already sitting there waiting for you.

Since these thresholds and lists can be revised, it's worth checking Health Canada's current fragrance allergen list before you lock in labeling for a big print run. If the math of tracing essential oil percentages through a blend into final allergen concentrations is the part that eats your time, that's exactly the kind of ingredient-level mapping Cosmetic Comply handles automatically when you file.