Lipstick Colorants and the Heavy Metal Limits You Track

Lip products get more regulatory attention than almost any other cosmetic category, and it's not really about the colorants themselves. It's about the fact that lipstick gets ingested, in small amounts, repeatedly, over the life of the product. That single fact shapes most of what you need to think through before you notify one.

Why lip products are treated more carefully

Skin absorption is the main exposure route for most cosmetics. Lip products add an ingestion route on top of that, because people eat, drink, and lick their lips constantly while wearing it. Regulators generally hold colorants and impurities intended for lip use to a tighter standard than the same substances used on, say, an elbow. This is why a colorant approved for general skin use isn't automatically cleared for the lip or eye area. You have to check the specific permitted use, not just whether a colorant is permitted somewhere.

Colorants: check the intended use, not just the name

Common lip colorants include iron oxides (INCI "Iron Oxides," various CI numbers depending on the specific oxide), various lakes, and natural colorants like carmine. Each carries its own permitted-use profile, and permitted lists are frequently organized by CI number, which is part of why keeping track of the CI number alongside the INCI name matters more for lip products than for a body lotion.

Before you finalize a lipstick colorant choice:

1. Confirm the specific CI number of the pigment or lake you're using, not just the family name like "iron oxide" or "lake."
2. Check whether that specific CI number is listed as permitted for lip use specifically, since general cosmetic permission and lip-specific permission aren't always the same thing.
3. If you're using a natural colorant like carmine, be aware it's also a known allergen for some people and is insect-derived, which some markets require disclosure of on the label independent of its colorant status.

Heavy metal and impurity limits

This is the part that catches makers off guard, because it's not about an ingredient you deliberately added. It's about trace impurities that can be present in raw materials, especially colorants, even when the supplier didn't add them on purpose. Lead is the one that gets discussed most, since trace lead can occur as an impurity in some mineral-derived colorants and other raw materials depending on sourcing and processing quality.

What this means practically:

• Ask your supplier for impurity testing on colorants specifically intended for lip products, not just a general certificate of analysis. A good supplier selling into the cosmetics market should be able to provide impurity data covering lead and other relevant heavy metals.
• Impurity limits are a genuinely market-specific detail. Exact permitted thresholds for lead and other heavy metal impurities differ by market and do get revisited, so this is a case where checking the current regulator guidance directly, rather than relying on a number you remember from a past project, is the right habit.
• This isn't unique to lipstick, but lipstick is where it matters most. The same impurity in the same colorant used in an eyeshadow or a body lotion carries a different practical exposure risk than in a product people apply to their mouths multiple times a day.

A working checklist for a lipstick filing

Step	What to verify
Colorant identity	Exact CI number for each pigment or lake used
Lip-specific permission	Confirm the colorant is permitted for lip/mouth-area use, not just general cosmetic use
Impurity documentation	Supplier data on lead and other heavy metal impurities for lip-intended colorants
INCI declaration	Correct INCI name for each colorant and any coating (e.g., mica coated with iron oxides)
Allergen check	Fragrance and flavor components checked against current allergen disclosure thresholds
Base formula	Waxes, oils, and emollients declared with correct INCI names and concentrations

Flavor and fragrance in lip products deserve a second look too

Lip products often contain flavor oils rather than, or in addition to, fragrance. These can include the same allergen-triggering compounds found in fragrance, like limonene or linalool if a flavor oil is derived from a citrus or floral source. Since these products are applied to and around the mouth and get some incidental ingestion, it's worth being just as careful with flavor ingredient disclosure as with fragrance, checking current allergen disclosure thresholds for whichever market you're filing in.

Filing it once you've cleared the ingredient checks

Once your colorants, impurity documentation, and flavor or fragrance components are sorted, the actual Canadian filing mechanics are the same as any other product: Cosmetic Notification Form through the Cosmetic Notification System, INCI names with concentration or concentration range, checked against the Cosmetic Ingredient Hotlist, filed within 10 days of first sale. The extra diligence for a lipstick happens before you get to that form, in confirming your colorants and impurities are actually appropriate for lip use.

Because lip products carry this extra layer of ingredient scrutiny, it's exactly the kind of product where having every ingredient's INCI name, CAS number, and restricted-list status checked systematically matters most. Cosmetic Comply screens each ingredient against the current restricted list with a confidence score and has a real compliance reviewer check the result before anything gets filed, which is particularly useful for a category like lip products where the stakes for getting a colorant or impurity call wrong are higher than average.