Attard & Attard 2022 — Heavy metals in cosmetics (review)
This is a comprehensive review chapter compiling published studies on lead, cadmium, nickel, mercury, and arsenic in cosmetics, with a multivariate meta-analysis across 16 cosmetic formulation categories. The headline finding: lipsticks, eye shadows, face paints, makeup foundation, and skin-lightening creams carry heavy-metal loads substantially above other facial and body products. The review documents the regulatory fragmentation across US FDA, WHO, EU, and Canadian authorities, which differ on permissible limits by an order of magnitude for several analytes. Useful as broad-scope context for any Cat 2 (Children Personal Care) row that draws on adult-cosmetic literature pending dedicated pediatric-cosmetic occurrence studies.
Key numbers
This is a review, not a primary occurrence study. The most usable data points are the regulatory limits cited (which differ substantially across jurisdictions) and the qualitative category rankings.
Cited regulatory limits across cosmetics jurisdictions (all in ppm, finished cosmetic product):
| Jurisdiction | Pb | Cd | Ni | tHg | tAs | Cr | Source authority |
|---|---|---|---|---|---|---|---|
| US FDA CIR Expert Panel | 5 | (other HM 20) | 20 | 20 | 5 | 20 | CIR Expert Panel guidance |
| WHO | 10 | 0.3 | — | 1 | — | — | WHO cosmetics guidance |
| European Union | 0.5 | 0.5 | — | — | — | 1.0 | EC Regulation No 1223/2009 cosmetics |
| Canada | 10 | 3 | — | 3 | — | — | Health Canada Guidance on Heavy Metal Impurities |
The 20x range between EU’s Pb 0.5 ppm and WHO/Canada’s Pb 10 ppm, and the 10x range between EU’s Cd 0.5 ppm and Canada’s Cd 3 ppm, reflect that cosmetic heavy-metal regulation is policy-driven and not anchored on a single toxicological floor.
Category-level qualitative findings from the multivariate meta-analysis:
Higher heavy-metal load categories: lipsticks, eye shadows, face paints, makeup foundation, skin-lightening creams.
Lower heavy-metal load categories: most other facial and body products (soaps, shampoos, body lotions reported as relatively cleaner in the reviewed dataset).
The chapter does not aggregate per-category numerical distributions; readers must trace to the cited primary literature for occurrence values.
Methods
Literature review and multivariate meta-analysis of studies measuring Pb, Cd, Ni, Hg, As in cosmetics across 16 formulation categories. No primary measurement. The chapter is published under CC BY in InTechOpen’s Environmental Impact and Remediation of Heavy Metals volume. Limitations: the chapter is a narrative review with a meta-analysis component; the systematic-review methodology (PRISMA-style inclusion criteria, study quality scoring, formal heterogeneity assessment) is not fully detailed.
Implications
Certification: For Cat 2 (Children Personal Care), this source provides:
- The regulatory-limit comparison across US/EU/WHO/CA that any HMTc Cat 2 threshold must reconcile against.
- Documentation that skin-lightening creams and face paints carry the highest heavy-metal load among cosmetic categories, which is directly relevant to certifying products intended for children where dermal absorption and accidental ingestion (face paint near mouth, lipsticks) are exposure pathways.
- The mode-of-entry summary: dermal absorption is the primary route for Pb/Cd/Hg in topical cosmetics; the stratum corneum acts as both a barrier and a reservoir, with accumulation over repeated application. Nickel’s allergic contact dermatitis risk is documented as the dominant clinical concern.
Courses: Excellent overview chapter for a Cat 2 course module on cosmetic heavy-metal exposure. The metallokinetics section (absorption, distribution, metabolism, excretion via dermal route) is well-explained and citable.
App: The 16-category framework in the meta-analysis maps roughly to consumer-app product categories. Skin-lightening creams and face paints should be weighted higher than soaps/shampoos in any Cat 2 per-application risk model.
Microbiome: Not addressed. Cosmetic-skin-microbiome interactions are out of scope for this chapter.
Wiki pages updated on ingest
- lead
- cadmium
- nickel
- mercury-total
- arsenic-total
- children-personal-care
- eu-1223-2009-cosmetics (to be created)
- fda-cir-cosmetic-impurities (to be created)
- who-cosmetics-guidance (to be created)
- health-canada-cosmetic-impurities (to be created)