What to Do When a Supplier Won't Share Allergen Data

You email your fragrance supplier asking for the allergen breakdown of the blend you've been using for two years, and you get back a generic safety data sheet, or silence, or a polite "that's proprietary information." Meanwhile the clock is running on List 1 fragrance allergens becoming mandatory on the CNF and label in Canada on April 12, 2026, with List 2 following August 1, 2026. This is a more common problem than it should be, and there are real ways through it.

Why this happens

Fragrance houses protect their formulas the way a chef protects a recipe. The blend you bought as "Vanilla Amber No. 4" might contain thirty components, and the supplier's business is built partly on you not knowing exactly what's in it. That's fine for trade secrecy, but it runs straight into the fact that regulators need to know if allergens like limonene, linalool, citronellol, geraniol, eugenol, or coumarin are present above the disclosure thresholds, above 0.001% (10 ppm) in leave-on products and above 0.01% (100 ppm) in rinse-off products.

The good news is that suppliers don't need to give you their full formula to satisfy this. They just need to tell you which allergens are present and at what concentration in the blend, so you can calculate the real concentration in your finished product. That's a much smaller ask than "give me your recipe," and it's worth reframing your request that way.

Step one: ask for the right document, not the whole formula

A lot of stalled requests happen because the maker asked for "your fragrance formula" and the supplier, reasonably, said no. Ask instead for an allergen declaration or IFRA-style allergen statement, a standard document format that lists only the regulated allergens and their percentages in the blend, nothing else. Most established fragrance houses have this on file already because international markets have required it for years. If your supplier balks at a full formula but has never been asked for just the allergen statement, try that exact phrase first.

Step two: escalate through the right contact

If the first email bounces off a general inbox, ask specifically for their regulatory affairs or compliance contact rather than your usual sales rep. Sales reps often don't know this document exists or where it lives. A regulatory contact usually can produce it in a day, because they've fielded this request from EU customers for years under Regulation (EC) No 1223/2009, which has required allergen disclosure for longer than Canada has.

Step three: put a deadline and a reason in writing

Suppliers respond faster when they understand there's a hard regulatory date attached, not just a curious customer. A short, specific email works better than a vague one:

• State the exact allergen list you need (List 1, or List 1 and List 2 if you're preparing ahead of August 2026)
• State your filing deadline
• Ask directly whether each of the seven common allergens is present and at what percentage, even if the answer is "not present" for most of them

Step four: know your alternatives if they truly won't provide it

If a supplier genuinely refuses, you have a few paths, roughly in order of how much they disrupt your production:

1. Switch suppliers. Harsh, but if a fragrance house won't provide allergen data at all, they're increasingly out of step with where multiple markets are heading, and another supplier selling a similar blend likely will cooperate.
2. Request a certificate of analysis instead of a full declaration. Some suppliers are more comfortable providing a lab-tested allergen result than a formulation-based declaration. Either satisfies the same underlying need.
3. Reformulate around a fragrance you can get full data for. Not ideal mid-production run, but sometimes faster than a standoff.
4. Have the blend independently tested. This costs money and time, but a third-party lab can identify and quantify the seven or so common allergens directly from a sample, sidestepping the supplier entirely.

Don't let this become a last-minute scramble

The realistic lesson here is to ask for allergen data before you commit to a fragrance supplier, not after you've built a product line around their blend. If you're currently formulating anything new, build the allergen data request into your supplier vetting from day one. It's much easier to walk away from a fragrance house at the sourcing stage than to renegotiate your whole supply chain three weeks before a filing deadline.

Once you do have the allergen numbers in hand, remember they're percentages of the blend, not of your finished product, so you'll still need to multiply by your fragrance's use level in the final formula to get the real, filing-ready concentration. Cosmetic Comply carries that math through automatically once you enter your ingredient list and use levels, so a supplier's blend percentage doesn't get lost in translation on the way to your CNF.