Lead & Cadmium in Cookware Glazes
Lead oxide · PbO · Cadmium sulfide · CdS · Glazed ceramic cookware leachables
What it is
Lead and cadmium used as flux and colorant additives in cheap ceramic glazes, respectively. Lead oxide (PbO) lowers the glaze melting temperature and improves gloss; cadmium compounds produce bright red, orange, and yellow glaze colors. When glazes are fired at insufficient temperatures or are worn, lead and cadmium can leach directly into food.
In this product: Glaze flux and colorant in cheap imported glazed ceramic and aluminum-alloy cookware, not functional cooking ingredients but contaminants that migrate into food.
Dose & route, what actually matters
Ingestion, lead and cadmium leach from glaze into food, particularly with acidic foods (tomato sauce, citrus), prolonged cooking, and from damaged or worn surfaces. Dietary ingestion is the relevant route; lead from food has no threshold below which adverse effects are absent.
EUROPEAN UNION
EU Directive 84/500/EEC (Ceramic Articles Directive): lead limit for cookware (Category 3 fillable cooking articles) = 1.5 mg/L acetic acid leach test; cadmium limit = 0.1 mg/L. EU Commission actively reviewing to lower these limits and add additional metals (aluminum, arsenic, barium, cobalt, chromium, nickel).
UNITED STATES
FDA 21 CFR: lead leaching limit for ceramic flatware ≤0.5 mg/L. FDA position for cookware: ‘the marketing in interstate commerce, including importation, of cookware that exhibits any level of leachable lead upon testing is prohibited’ (near-zero tolerance). FDA issued a public warning in August 2025 and an updated warning in November 2025 specifically about imported aluminum-alloy cookware (Hindalium/Hindolium/Indalium/Indolium brands) that tested positive for lead leaching under food-simulant conditions.
The evidence
FDA August 2025 Public Warning: ‘Some types of imported cookware products made from aluminum, brass, and aluminum alloys known as Hindalium/Hindolium or Indalium/Indolium have been tested by FDA and state partners, and have demonstrated the potential to leach lead under conditions designed to mimic their use in contact with food.’ Updated November 2025 to add six additional products.
regulatory · 2025 · source
IARC: Inorganic lead compounds Group 2A (probably carcinogenic to humans); Cadmium and cadmium compounds Group 1 (carcinogenic to humans). There is no established safe level of lead exposure for neurological effects.
regulatory · 2023 · source
California Prop 65: Lead and lead compounds listed on California Prop 65 as both carcinogen and reproductive toxicant. Cadmium listed as a carcinogen. Required Prop 65 warning for ceramic tableware: ‘Use of this tableware will expose you to lead.’
How to avoid it
Avoid unbranded, imported, or very cheap glazed ceramic and aluminum-alloy cookware, especially from unknown origins. Choose cookware with NSF certification or from brands with verifiable quality controls. Cast iron, stainless steel (food grade 18/10), and anodized aluminum from reputable brands are safe alternatives.
Where it hides
Editorial analysis of publicly available regulatory and peer-reviewed sources. Not medical advice. We name our evidence and link it, including when an ingredient is fine.