Safety researchers have identified a regulatory "blind spot" in the global oversight of lip cosmetics, raising questions about how the category is assessed for repeated oral and dermal exposure compared with leave-on skin or rinse-off formats.

The finding, reported by Medical Xpress, centers on lipsticks, lip balms, lip glosses, tinted balms and similar products that occupy a hybrid exposure position: applied to the skin of the lips but routinely ingested in small, cumulative amounts throughout the day. Standard safety dossiers for cosmetics generally evaluate dermal absorption in isolation, while food-grade ingredients undergo an entirely separate regulatory pathway. Lip products fall between those two regimes, the researchers argue, and that gap is not consistently addressed across major markets.

What makes lip products different?

A typical lipstick wearer ingests an estimated 0.4 to 4 kilograms of product over a lifetime, according to commonly cited exposure modeling used by industry toxicologists. That figure dwarfs the systemic exposure profile assumed for a face cream or a rinse-off cleanser. Yet ingredient review for lip color rarely follows the more conservative oral-exposure threshold applied to food-contact materials, and it rarely mirrors the full dermal assessment applied to facial leave-on products.

The result, the experts contend, is a category whose safety files are built on assumptions that match neither of the two regulatory frameworks they most closely resemble.

Where regulators diverge

Regulatory treatment of lip products varies sharply by jurisdiction:

• European Union: Cosmetics Regulation 1223/2009 treats lip products as leave-on cosmetics, with the same dossier requirements as face creams. The SCCS has issued opinions on several lipstick-specific ingredients, including titanium dioxide and certain pigments, but no separate oral-exposure assessment is mandatory.
• United States: The FDA does not require pre-market approval for cosmetics. Lipsticks and balms are governed by the same MoCRA framework introduced in 2023 as other cosmetics, with color additives requiring separate batch certification.
• Japan and South Korea: Both treat lip products as a distinct sub-category with positive ingredient lists.
• China: The NMPA requires a special cosmetics registration for lip products, including human-use safety data.

That patchwork, researchers say, makes a single global safety standard for lip cosmetics effectively impossible under current rules.

Which ingredients sit in the gap?

The category uses raw materials that rarely appear in other cosmetic formats. Common lipstick and lip balm ingredients — including castor oil derivatives, candelilla and carnauba waxes, certain azo pigments, and flavor/fragrance compounds designed for oral contact — have toxicological data sets built for either skin or food, not both. When an ingredient has a low Acceptable Daily Intake (ADI) because of food-safety review, the cosmetics dossier may not reflect that ceiling. When a cosmetic-grade material lacks an ADI, regulators have no agreed oral threshold to apply.

For formulators, that ambiguity translates into uneven label procurement and reformulation pressure as one jurisdiction after another revisits lipstick-specific dossiers.

What changes for formulators and brands?

The downstream effects of the flagged gap are concrete:

• Compliance teams should expect closer scrutiny of pigment and flavor dossiers in upcoming EU and Asian reviews.
• Procurement officers should anticipate tightened supplier documentation for any ingredient with both food and cosmetic use.
• Treatment-menu operators and retail buyers should prepare for label and claim updates if harmonization moves forward.

What to watch next

The researchers' call for a harmonized framework is likely to surface first in SCCS opinion requests and in trade association submissions ahead of the next International Cooperation on Cosmetics Regulation (ICCR) meeting. Brands with lip lines sold across the EU, US, UK, Japan and China should track the next SCCS agenda for any lipstick-specific mandate, and review their pigment and flavor files before any 2026 dossier deadlines.

For now, the category's most distinctive safety question — how to model a product designed to be partly eaten — remains formally unanswered across most of the world's largest cosmetics markets.