Metal Guide

Prop 65 & AB 1200 on Metal Products

What should I do about an AB 1200 disclosure or Prop 65 warning on metal?

The chemicals sort into three groups based on how much they actually deserve your attention.

Not worth your worry: These come down to one of three things, none of which describe what happens when you cook with the pan in your kitchen: The Clean Water Act, which limits how much of a substance industrial factories can dump into rivers and lakes. The CDC's National Exposure Report, which measures what shows up in the general population's blood and urine. This is just a measurement, not a finding that the chemical is causing harm. And, inhalation toxicity in workers, who breathe in metal dust or fumes during welding, smelting, or manufacturing. Different exposure route, different dose, and a totally different risk profile than using cookware made with these elements:

• Iron. An essential nutrient. Your body carefully controls how much iron it absorbs from food and gets rid of the rest. Iron is on the AB 1200 list only because the Clean Water Act regulates industrial iron in waterways (where it can stain water, affect taste, and harm fish). Nothing to do with the pan you're cooking in.

• Manganese. An essential nutrient that supports bone development, enzyme function, and iron metabolism. A healthy person handles dietary manganese just fine and clears the excess. Manganese shows up on the AB 1200 list partly for environmental reasons and partly because of a rare condition called manganism, a Parkinson-like illness in welders, miners, and battery workers who breathed manganese dust over years of unprotected work. Not relevant to eating off a stainless steel pan.

• Aluminum. Found in food, water, antacids, and finished cookware. Healthy adults absorb very little of the aluminum they eat, and the kidneys clear what does get absorbed. Listed for environmental reasons, drinking water limits, and worker inhalation exposure. None of these citations are about cooking with an aluminum pan. (People with chronic kidney disease may still want to limit aluminum cookware just in case, since impaired kidneys can't clear it as well.)

• Copper. An essential nutrient. Your body controls how much you absorb and clears the rest. Listed mostly for environmental and biomonitoring reasons, with one citation about workers breathing in copper dust or fumes.

• Zinc. An essential nutrient your body needs for immune function, wound healing, and dozens of enzymes. The amount you get from food is well within a safe range. Listed for environmental reasons and because zinc shows up in routine population biomonitoring — a baseline measurement, not a finding of harm.Only a concern for allergic individuals. The body easily clears these metals, unless you have a nickel allergy (17% of women, 3% of men) or chromium allergy (1 to 3% of the population).

Only a concern for allergic individuals. Your body easily handles these metals, unless you have a nickel allergy (17% of women, 3% of men) or chromium allergy (1 to 3% of the population):

• Nickel. Listed as a known carcinogen by several authoritative bodies, based on workers breathing nickel dust and fumes during refining and welding. For people without a nickel allergy, the small amount that comes off a stainless steel pan poses no meaningful risk — your body clears it. For people with a nickel allergy, stainless steel cookware can cause skin reactions or more widespread symptoms and is worth avoiding.

• Chromium. "Total chromium" on a disclosure usually means the combination of chromium III (the harmless dietary form found in stainless steel) plus tiny amounts of chromium VI (the toxic form, discussed below). Chromium III is actually a trace nutrient involved in how your body handles glucose, and it's found in foods and supplements. People with a chromium allergy can get contact dermatitis from chromium finishes. For everyone else, the chromium III in your stainless steel pan isn't something to worry about.

• Chromium III. Listed only because of the Clean Water Act, which regulates chromium III in industrial wastewater. Same essential-nutrient form as above. It often appears as its own line item on AB 1200 disclosures because the regulatory list treats each oxidation state separately, but it's the same dietary form you'd find in your multivitamin.

Worth your attention. These chemicals move out of metal products as tiny particles or dissolved bits, sped up by heat, acid, abrasion, and time. Avoid acidic cooking (tomato sauce, citrus, vinegar braises) in pans where any of these are disclosed, don't preheat an empty pan, and don't use any pieces with visible wear on the cooking surface. For children, avoid lead-containing products completely rather than mitigating.

• Lead. A potent neurotoxin with no safe exposure threshold in children. Causes cognitive deficits, behavioral problems, and developmental delays, with effects measurable at blood levels once considered acceptable. In cookware, lead shows up in some imported aluminum (contaminated from scrap-metal sources), some brass alloys, and as a trace contaminant in some enamels. Worth avoiding outright wherever possible.

• Cadmium. A kidney toxin and human carcinogen that bioaccumulates in the body over decades. In cookware, found in red, orange, and yellow enamel pigments. Migration into food increases with acidic ingredients and surface wear.

• Hexavalent chromium (chromium VI). Distinct from the dietary form. Hexavalent chromium is a confirmed human carcinogen, primarily by inhalation, and is toxic by ingestion at much lower levels than the trivalent form. Rare in finished consumer cookware, but can appear in some specialty industrial coatings.

• Cobalt. Associated with heart muscle damage at chronic moderate doses, and a possible carcinogen by inhalation. Found in blue and green enamel pigments and in some specialty metal blends. Of particular concern for people with cobalt allergy or thyroid conditions.

• PFAS. A class of long-lasting chemicals linked to kidney and testicular cancer, thyroid disease, immune suppression, and developmental effects. Don't break down in the environment or the body. In cookware, found in non-stick coatings under many brand names. Migration increases with overheating above about 500°F and with surface wear, so keep heat moderate and replace at the first sign of scratching or flaking.

• Antimony trioxide. A possible human carcinogen by inhalation, linked to heart and developmental effects at higher exposures. Found in some enamel pigments and in metal blends. The Prop 65 listing is based on inhalation studies, but ingestion concerns rise when the antimony is in a food-contact pigment that wears with use.

In short: mitigate and reduce exposure where it makes sense, avoid where it doesn't, and move on with your life when the warning is about industrial exposure to a metal you'd never inhale from a finished pan.

What does a Prop 65 warning on metal mean?

A Prop 65 warning means the product contains, or might contain, a substance on California's list of chemicals known to cause cancer or reproductive harm. It does not necessarily mean the product is dangerous to use. That’s because Prop 65 is a right-to-know law, not a product safety law. It requires warnings at levels 1,000 times below the level that would actually cause harm.

There are three reasons a brand might put a Prop 65 sticker on a metal product:

• The product contains a listed chemical at levels that exceed Prop 65's daily exposure limit.

• The product contains a listed chemical below the exposure limit, but the brand labels as a legal precaution because the cost of a lawsuit is much higher than the cost of a sticker.

• The product is part of a category where Prop 65 listings apply broadly, and the brand labels the entire line the same way rather than testing each piece.

The sticker doesn't tell you which specific chemical it's for, and brands often won't disclose the answer even when asked. Knowing the most likely candidates for the product category is the best way to interpret what you're seeing.

What does an AB 1200 disclosure on metal mean?

AB 1200 is a California right-to-know law specific for cookware. It requires brands to disclose whether any chemicals on California's Department of Toxic Substances Control (DTSC) designated list were intentionally added to the food-contact surface or the handle. Brands also can't claim a product is "free of" a chemical if any chemical in the same class was intentionally added.

The DTSC designated list contains around 3,300 chemicals, pulled from about 22 regulatory lists worldwide, including Prop 65, the EU's Substances of Very High Concern, IARC carcinogen classifications, and ATSDR neurotoxicants. Because the underlying list is so broad, most AB 1200 disclosures on metal cookware list the metals that make up the product itself plus trace metals from manufacturing. Each one has a reference to an often very alarming-looking toxicity database. The disclosure reads like a cancer warning even when the actual risk from finished cookware is very low. Read on for specific examples.

What's the difference between Prop 65 and AB 1200 for metal?

Both can appear on metal cookware, and a piece can comply with one and not the other.

Prop 65 asks: how much of a listed chemical does a person actually get from normal use of this product? The trigger is whether daily exposure exceeds a limit (for lead, 0.5 micrograms per day). The chemical can be intentionally added, can come from trace contamination, or can leach from natural sources in the raw materials. Prop 65 doesn't care which. It cares about potential exposure.

AB 1200 asks: did the manufacturer deliberately put a listed chemical into this product? The trigger is whether a chemical from the DTSC list was intentionally added to a food-contact surface or handle, regardless of how much actually migrates into food. AB 1200 doesn't care about migration. It cares about what the manufacturer chose to use and a consumer’s right to know.

Two examples make the difference concrete:

• A modern enamel pot uses no intentionally added lead, but trace lead from the raw materials pushes calculated daily exposure to 0.6 micrograms per day. Prop 65 requires a warning when that potential exposure exceeds the limit. AB 1200 requires no disclosure, since lead wasn’t intentionally added.

• A modern enamel pot uses a cadmium-pigmented red glaze. The cadmium is locked into the glaze, and leach testing shows migration below the Prop 65 exposure threshold. Prop 65 requires no warning, since your exposure is below the limit. But an AB 1200 disclosure is required, since cadmium was intentionally added to a food-contact surface.