Benzophenone UV Filters and Their Hotlist Conditions

A moisturizer maker asked me last month why her "with UV protection" day cream got flagged twice, once for the ingredient and once for the claim. Benzophenone derivatives do that. They sit in an odd spot where the substance itself has restriction conditions, and the reason you would even use it, sun protection, pulls the whole product into a different regulatory category.

What benzophenone compounds are doing in your formula

Benzophenone-3 (oxybenzone), benzophenone-4, and related compounds absorb UV radiation, which is exactly why they show up in sunscreens and in products that claim broad-spectrum protection. They also get used at lower levels as photostabilizers, helping protect other ingredients or the formula itself from UV degradation, without necessarily making a sun protection claim on the label.

That distinction, UV filter versus photostabilizer, matters a lot for how the ingredient is treated.

The Hotlist angle

Canada's Cosmetic Ingredient Hotlist lists prohibited and restricted substances, and several benzophenone-type UV filters carry specific conditions tied to concentration limits and permitted use categories. If you are formulating with one of these compounds, the first question is not "is it banned," it is "what conditions does the Hotlist attach to it, and does my intended use fit inside them." The Hotlist is the actual source here, and it gets updated, so pulling the current entry before you finalize a formula is worth the five minutes.

The bigger issue: the claim, not just the ingredient

Here is where things get interesting. Even if your benzophenone use level sits comfortably inside whatever restriction applies, the moment you put an SPF number or a phrase like "protects against UV rays" on your label, you are no longer making a cosmetic claim. You are making a drug claim, or in some markets a natural health product claim, and that pulls in a completely different set of labeling, testing, and registration requirements than a Cosmetic Notification Form covers.

This is the trap I see most often:

• A maker adds a benzophenone derivative for its photostabilizing effect on a fragrance or color
• Marketing writes "helps shield skin from sun damage" on the packaging
• The product is now functioning, at least on paper, as a sunscreen
• The CNF alone no longer covers what the label is claiming

The fix is usually simple once you see it: either drop the sun protection language entirely and keep the ingredient at a photostabilizer role and concentration, or accept that you are building a drug product and plan for that pathway from the start.

A quick concentration gut-check

Use case	Typical role	Regulatory posture
Low-level use to protect fragrance/colorant from UV fade	Photostabilizer	Still a cosmetic, subject to Hotlist condition on concentration
Higher-level use with an SPF number on the label	Active UV filter	Functions as a sunscreen drug, different pathway entirely
Higher-level use with no SPF claim at all	Ambiguous, invites scrutiny	Regulators may still assess it as an unlabeled drug claim

That last row is the one that catches people. Using a UV filter at a level that clearly does something photoprotective, while avoiding the words that would admit it, does not actually change what the product is doing. It just changes whether you disclosed it honestly.

Practical steps before you file

1. Pull the current Hotlist entry for the specific benzophenone compound you are using and check the concentration condition against your formula.
2. Decide honestly whether your use level and intended marketing put you in cosmetic territory or drug territory. If you are not sure, that uncertainty is itself a signal to get a second opinion before you commit to packaging.
3. If you are staying in the cosmetic lane, make sure your marketing copy does not accidentally cross into a sun protection claim.
4. Keep documentation on why you chose the concentration you did. If a reviewer asks, "we used it as a photostabilizer at X%, well under the Hotlist condition" is a much better answer than silence.

Benzophenone compounds are one of the clearer examples of why a Hotlist check has to happen alongside a label review, not instead of one. Cosmetic Comply screens the ingredient against the current restricted list and flags the concentration issue, but the claim question is still yours to answer honestly before you print packaging.