Foods that require a Prop 65 warning in California include chocolate and cocoa products, certain seafood (especially larger fish and some tuna), canned and jarred foods, root vegetables and leafy greens, rice and other grains, dietary supplements and herbal products, ground spices, teas, and all alcoholic beverages. The common thread is a listed chemical present above the state’s safe harbor level: heavy metals like lead, cadmium, arsenic, and mercury; BPA from packaging; or ethyl alcohol itself. A warning does not mean the food violates federal safety standards or will make you sick, which is why so many everyday grocery items carry one.
Foods That Commonly Carry the Warning
Chocolate and Cocoa Products
Chocolate is one of the most recognizable warning carriers. Cocoa plants absorb lead and cadmium from soil, and those trace metals concentrate during processing. Dark chocolate, with more cocoa solids, tends to show higher concentrations of both metals than milk chocolate. California’s safe harbor level for lead as a reproductive toxicant is 0.5 micrograms per day, and for cadmium (oral, reproductive toxicity) it is 4.1 micrograms per day.1Office of Environmental Health Hazard Assessment. Proposition 65 No Significant Risk Levels (NSRLs) and Maximum Allowable Dose Levels (MADLs)
Seafood
Larger, longer-lived fish such as king mackerel, shark, swordfish, and some tuna species accumulate mercury through the food chain. Recent enforcement activity has also flagged certain yellowfin and albacore tuna for PFOS, a synthetic “forever chemical” linked to waterway contamination. Smaller, shorter-lived fish generally carry lower levels.
Root Vegetables, Leafy Greens, and Grains
Plants pull lead and cadmium directly from soil and water. Carrots, sweet potatoes, and other root vegetables are efficient at absorbing whatever the soil contains, and leafy greens like spinach and kale do the same. Rice and other grains can concentrate arsenic. Organic certification does not change this, because the source is the soil itself rather than any synthetic input.
Canned and Jarred Foods
Bisphenol A (BPA) has historically been used in the epoxy linings of metal cans and the lids of glass jars. It can leach into the contents, especially acidic foods such as tomato products. Many manufacturers now use BPA-free linings, but some of the substitute compounds are also on the Prop 65 list.
Dietary Supplements and Herbal Products
Supplements are a perennial target. Herbal products, protein powders, and mineral supplements frequently contain detectable lead, cadmium, arsenic, or mercury, sometimes from the plant ingredients themselves and sometimes from manufacturing or sourcing. Enforcement data from February 2026 recorded 52 notices filed against supplement products in a single month, which suggests how widespread the issue is in that category.
Spices, Sauces, and Teas
Ground spices including turmeric, chili powder, and cinnamon regularly test positive for lead. Some of this comes from the soil where the plants grew, but studies have also found lead-based colorants added to certain imported spices. Teas can accumulate heavy metals from soil as well, particularly when brewed from older leaves of the tea plant.
Alcoholic Beverages
Beer, wine, and spirits carry warnings because ethyl alcohol is itself on the Prop 65 list as a carcinogen and reproductive toxicant. Any alcoholic drink sold in California triggers the warning requirement regardless of what else is in the bottle.
Why These Chemicals End Up in Food
Four pathways account for most food warnings, and knowing the source helps explain why even foods widely considered healthy end up labeled.
- Natural soil uptake. Lead, cadmium, and arsenic occur naturally in soil and water, and plants absorb them as they grow. This is why organic produce is not automatically exempt and why chocolate, rice, and root vegetables are frequent offenders.
- Environmental pollution. Industrial activity adds metals and synthetic chemicals to soil and waterways. Mercury in seafood is the classic case: coal-burning power plants release mercury into the atmosphere, it settles into oceans and rivers, microorganisms convert it to methylmercury, and fish accumulate it up the food chain.
- High-temperature cooking. Some chemicals form during preparation. Acrylamide develops when starchy foods are fried, roasted, or baked above roughly 250°F, though this one no longer triggers warnings on its own (see below).
- Packaging. BPA and related compounds can migrate from can linings, jar lids, and certain plastic containers into the food they hold, especially when heated.
What the Warning Actually Means
Proposition 65, formally the Safe Drinking Water and Toxic Enforcement Act of 1986, bars businesses from knowingly exposing someone to a listed chemical without a “clear and reasonable” warning.2California Legislative Information. California Health and Safety Code 25249.6 The list covers hundreds of chemicals the state has identified as causing cancer or reproductive harm.3Office of Environmental Health Hazard Assessment. Proposition 65 A warning on a food product does not mean the food breaks any federal safety standard. It means the product contains a listed chemical above California’s safe harbor threshold, and those thresholds are set with large safety margins.
For cancer-causing chemicals, the threshold is the No Significant Risk Level, calculated to produce no more than one additional cancer case in a population of 100,000 people exposed daily over a 70-year lifetime. For reproductive toxicants, the Maximum Allowable Dose Level is set at one one-thousandth of the level where no reproductive effects were observed in studies.4Office of Environmental Health Hazard Assessment. Proposition 65 Safe Harbor Levels Development
Those two thresholds can be very different for the same chemical. Lead has an NSRL of 15 micrograms per day as a carcinogen but a MADL of just 0.5 micrograms per day as a reproductive toxicant.5Office of Environmental Health Hazard Assessment. Lead A product that exceeds the lower number triggers a warning even if it sits comfortably below the higher one. That is why a chocolate bar with no realistic cancer risk from lead can still carry a Prop 65 label based on the reproductive standard.
The Acrylamide Carve-Out
Coffee, french fries, potato chips, toast, baked goods, and roasted nuts used to carry warnings because of acrylamide, which forms naturally when starchy foods are cooked at high temperatures. On May 2, 2025, the U.S. District Court for the Eastern District of California issued a permanent injunction in California Chamber of Commerce v. Bonta, finding that requiring businesses to warn consumers about dietary acrylamide violated the First Amendment because the warning asserts that dietary acrylamide causes cancer in humans despite significant scientific debate. The court permanently blocked the Attorney General and anyone acting on the state’s behalf from enforcing the acrylamide warning requirement for food.6California Department of Justice. Proposition 65 Enforcement Reporting Foods previously labeled solely for acrylamide no longer need a warning. If a product contains other listed chemicals alongside acrylamide, warnings for those other chemicals still apply.
What to Do With the Information
The warnings reflect California’s conservative thresholds, not a finding that the product is dangerous at the amount present. A chocolate bar carrying a lead warning may contain a small fraction of the lead a person would get from a day of drinking tap water that meets federal standards. The MADL is built on a thousand-fold safety margin, and the NSRL assumes 70 years of daily exposure.
The warnings are still worth reading. They identify which chemicals are present, which matters if you eat the same foods repeatedly. Rotating protein sources instead of eating high-mercury fish every day, varying your grains rather than defaulting to rice, and mixing up your leafy greens all keep any single exposure low. For dietary supplements, where contamination levels vary widely between brands, looking for products that publish third-party test results is one of the more effective ways to manage exposure beyond what a label alone can tell you.