When an INCI Name Hides a Hotlist Substance

A maker sent me a supplier spec sheet once that listed an ingredient as "Rosemary Antioxidant CO2 Extract." Sounds lovely, sounds natural, sounds like the kind of thing you'd put on a label without a second thought. What it actually was, once you traced the composition, was a concentrated extract carrying meaningful levels of a compound with its own restriction. The trade name told you nothing about that. The INCI name and the underlying chemistry told you everything.

This is the exact gap that trips up careful, well-intentioned makers. You can do everything right, source from a reputable supplier, read every spec sheet you're given, and still end up with a restricted substance in your formula because the name in front of you wasn't the name that matters.

Trade names are marketing, INCI names are chemistry

A trade name exists to sell an ingredient. It's meant to sound appealing, natural, proprietary, or scientific, depending on the audience. None of that is dishonest exactly, but none of it is regulatory either. Trade names never appear on a cosmetic notification filing. What goes on the filing, and what regulators actually screen against restricted and prohibited lists, is the INCI name, the standardized identifier every cosmetic ingredient is supposed to carry.

The problem is that a single trade name can map to an INCI name you wouldn't recognize on sight, and that INCI name can itself carry a CAS number tied to a Hotlist entry you'd never guess from the marketing.

How the mismatch actually happens

A few common ways a hotlist substance hides behind a friendly name:

• Botanical extract names that don't disclose isolated constituents. An extract can be sold under its plant name while carrying a concentrated level of one specific compound that has its own restriction, separate from the whole extract being generally accepted.
• Supplier blends. A blend product has its own trade name and its own INCI listing as a mixture, but the actual restricted component is buried at a percentage you only find by reading the blend's full component breakdown and doing the math: multiply the component's percentage within the blend by the blend's use level in your formula. A blend used at 2% that's itself 5% of a restricted ingredient means that ingredient sits at 0.1% of your finished product, not 5%.
• Ingredients with multiple CAS numbers. Some substances have more than one CAS number depending on manufacturing origin or isomer form, and a restriction may be written against one CAS number while your supplier documentation cites another for what is, chemically, the same substance.
• Old formulation notes. A recipe passed down from another maker, or copied from an old blog post, may use an outdated or regional ingredient name that no longer matches current INCI nomenclature.

Tracing an ingredient back to what it really is

Step	What you're checking
1. Get the actual INCI name	Not the trade name, not the marketing description
2. Get the CAS number	Confirms exact chemical identity, since names alone can be ambiguous
3. Check for blend components	If it's a blend, get the full component list and percentages
4. Calculate real concentration	Component % in blend × blend's use level in your formula
5. Screen against the Hotlist	Check the resolved INCI/CAS against Canada's Cosmetic Ingredient Hotlist for prohibited or restricted status

Skipping step 1 is the most common shortcut, and it's the one that causes the most trouble, because everything downstream depends on having the right name to check in the first place.

Why this matters more than it seems to

Health Canada's Cosmetic Notification Form asks for ingredients by INCI name with concentration or a concentration range, and the Cosmetic Ingredient Hotlist is checked against that same INCI/CAS identity. If your filing lists a trade name, or an INCI name that's subtly wrong, the whole notification can be inaccurate even though you filled it out in good faith. Nobody set out to hide anything. The name on the spec sheet just wasn't the name that mattered.

This is also why "my supplier told me it's fine" isn't really an answer. Suppliers aren't always thinking about your finished product's category or your target market's specific restricted list. Some are excellent about this, many aren't, and the responsibility for what's actually in your bottle and on your filing sits with you either way.

Making the trace less error-prone

This is precisely the kind of detail work that benefits from a second set of eyes, or better, a system built to catch it automatically. Cosmetic Comply takes your ingredient list, resolves trade names and blend components down to their real INCI names and CAS numbers, carries the math through on blend percentages, and screens the resolved composition against the Hotlist with a confidence score before a human reviewer checks it. If you're formulating with an extract or blend you're not fully sure about, it's worth tracing it all the way down before it goes anywhere near a filing.