Menthol and Camphor: Hotlist Limits in Balms

Balm makers love menthol and camphor because they work. That cooling snap, the muscle-rub sensation, the "this is doing something" feeling a customer gets when they rub it on a sore shoulder, all of it comes from these two ingredients doing exactly what they're known for. Which is also precisely why they're restricted rather than freely usable at any concentration you like.

Why these two specifically

Menthol and camphor are both on the Cosmetic Ingredient Hotlist, Health Canada's list of substances that are either prohibited outright or restricted to a maximum concentration in cosmetic products. They're restricted rather than banned, meaning you can use them, but only up to a ceiling, and the reasoning behind that ceiling matters more than the number itself.

Both ingredients produce a physiological effect, the cooling or warming sensation, that's dose-dependent. At low concentrations, that's a cosmetic sensory effect, similar to how a tingling toothpaste or an astringent toner works. Push the concentration high enough and you cross into "this is meant to relieve pain or treat a condition" territory, which is a therapeutic claim, not a cosmetic one.

What the Hotlist is actually protecting against

The Hotlist exists to keep cosmetic products cosmetic. When an ingredient's concentration climbs past its listed limit, the product isn't automatically illegal, but it typically can no longer be sold as a cosmetic under a cosmetic notification. It starts to look, functionally and legally, like a drug or a natural health product, which brings a completely different and more demanding regulatory pathway.

This is why balm and rub formulators hit this issue constantly. The entire appeal of a muscle rub is the intensity of the sensation, so there's commercial pressure to push concentrations higher, right at the exact point where the product's classification becomes shaky.

Practical formulating guidance

• Check the current Hotlist entry before you finalize a formula. Limits are specific to the ingredient and sometimes to the product category, and this is exactly the kind of number that should be pulled fresh rather than remembered from a past formulation, since Hotlist entries do get revised.
• Watch your total from all sources. If your balm includes both a menthol crystal addition and an essential oil that's naturally rich in menthol, like some mint oils, the concentrations add up. The Hotlist limit is on the total ingredient in the finished product, not per ingredient source.
• Consider what claim you're actually making. A balm labeled "soothing" and "cooling sensation" sits differently than one implying it "relieves muscle pain" or "reduces inflammation." The claim and the concentration need to agree with each other, because a regulator or a competitor complaint will look at both together.

A simplified concentration table

This is illustrative only. Always confirm the live figures against the current Hotlist before filing.

Ingredient	Common role in balms	Regulatory status
Menthol	Cooling sensory agent	Restricted, concentration ceiling applies
Camphor	Warming/cooling sensory agent	Restricted, concentration ceiling applies
Menthol-rich essential oils (e.g., peppermint)	Natural source of menthol	Contributes to total menthol load

What happens if you're over the limit

If your formula genuinely needs a menthol or camphor level above the cosmetic ceiling to achieve the effect you're marketing, that's a real signal worth sitting with rather than working around. It usually means the product is functioning as, and should be regulated as, a therapeutic product rather than a cosmetic. That's a different filing pathway entirely, with different safety and efficacy expectations, and trying to squeeze a drug-strength formula through a cosmetic notification is the kind of shortcut that tends to surface during a compliance review or a customer complaint investigation.

Where this fits into your filing

When you're preparing a Cosmetic Notification Form, the Hotlist check isn't a side task, it's part of confirming the product is even eligible to be filed as a cosmetic in the first place. Getting the concentration math right on ingredients like menthol and camphor, especially when they're arriving from multiple sources in the same formula, is one of the more common places small errors creep in.

Cosmetic Comply runs every ingredient in your formula against the current prohibited and restricted lists automatically, flags anything near or over a concentration ceiling with a confidence score, and has a real compliance reviewer look at the result before anything gets filed. For a category like balms, where the line between cosmetic and drug is genuinely close, that extra check is worth having.