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You’ve probably seen it before: that small, ominous label on household products, food packaging, and even online retail listings.

It reads, “WARNING: This product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm.”

But what does it really mean, and should you feel concerned?

What Is the California Proposition 65 Warning Label?

The California Proposition 65 warning label is part of the Safe Drinking Water and Toxic Enforcement Act of 1986. Its purpose is to protect Californians by informing them about potential exposure to harmful chemicals.

Businesses selling products in California must provide “clear and reasonable warnings” if they knowingly expose people to any listed chemical.

If a product contains substances linked to cancer, birth anomaly, or reproductive harm, it receives this label. Though this policy is in effect mainly within California, you might encounter it elsewhere due to online sales or products shipped across state lines.

As part of the law, the state must publish a list of chemicals that are “known to the State of California to cause cancer or reproductive toxicity.”

The list contains more than 900 chemicals and gets updated at least once a year. The complete list is on the California Office of Environmental Health Hazard Assessment (OEHHA) website.

Which Products May Have Proposition 65 Warnings?

When a warning appears on a product label, the business knows the product contains one or more listed chemicals.

Prop 65 applies to various consumer products, including apparel, textiles, jewelry, accessories, and home goods.

Some of these products may carry the label, among others:

• Appliances
• Clothing
• Dishes
• Electrical wires
• Flashlights
• Food items
• Furniture
• Hair dryers
• Jewelry
• Light fixtures
• Padlocks
• Pesticides

Which states require a Proposition 65 warning?

Only California law requires Proposition 65 warnings. They appear throughout California in a wide range of settings, including (but not limited to) restaurants, grocery stores, hotels, schools, and hospitals. They also appear on a wide variety of products.

What Chemicals Does Proposition 65 Include?

A California board of experts reviews chemical toxicity data to identify potential health risks. Even small amounts of these chemicals require the warning label.

These chemicals are additives or components found in pesticides, everyday household products, food, medications, dyes, and solvents.

So, what’s the deal with these chemicals? The 900-plus flagged chemicals are associated with cancer, birth defects, or reproductive harm.

Products containing these chemicals come with Proposition 65 labels, among others:

• 4-methylimidazole — Found in caramel color.
• Acrylamide — Found in roasted coffee beans and certain foods.
• Bisphenol A (BPA) — Commonly associated with canned goods.
• Lead — Present in various products, including tea leaves and canned or bottled items.

Should You Avoid Products with Proposition 65 Warnings?

The label doesn’t necessarily mean the product violates safety standards or will harm you.

When a Proposition 65 warning occurs on a product, you must consider it in context with your other environmental and dietary chemical exposures.

Consider where you live. If you’re in California, the label is more common due to state regulations. Outside California, it’s less prevalent. However, awareness is crucial regardless of your location.

Should you eat something with a Proposition 65 warning?

Chemicals can enter food intentionally or unintentionally through various sources, including manufacturing, agriculture, packaging, and cookware. These chemicals can cause acute or chronic food poisoning or illness, and some can even lead to long-term health issues.

Some chemicals can accumulate. This means that negative effects may appear only when high amounts have built up in the body.

Eating food products with Proposition 65 warning labels occasionally isn’t a cause for panic. Follow these tips to lower your risk of harmful effects:

• Stay informed — Familiarize yourself with the chemicals listed under Proposition 65. These include substances like acrylamide (found in roasted coffee beans) and mercury, which can accumulate in certain types of seafood.
• Moderation is key — Try a balanced approach. Treat products with Proposition 65 warnings like occasional treats rather than everyday staples. Limiting exposure to these chemicals can reduce potential health impacts.
• Choose wisely — When you encounter a Proposition 65 warning, consider alternative products that adhere to the regulations. Businesses are exempt from warnings if exposure to a chemical is minimal.

How Can You Navigate Life with Proposition 65?

The warning gives you the “right to know,” but you’re responsible for assessing the actual risk. Some products may contain small amounts of these chemicals, which might not pose a significant danger. But you should still bear in mind the following:

• Familiarize yourself with the Proposition 65 label and remember it warns against potential exposure. It doesn’t represent an immediate threat to your health and safety.
• Everyone’s tolerance varies. You may choose to avoid these products altogether, while others may not worry you as much. Listen to your body and instincts.
• Contact the manufacturer. Do you feel concerned about a Proposition 65 label? If you’re unsure about a specific product, contact the manufacturer. They can provide additional information. Remember, other agencies regulate product safety beyond Proposition 65.
• Stay informed. As research evolves, our understanding of these chemicals improves. Look for updates and adjust your choices accordingly.

Remember, the Proposition 65 warning is a tool for transparency. It empowers you to make informed decisions.

So, next time you spot that label, take a moment to consider the context and choose wisely. Your health matters and knowledge is your ally.

Editor's Note: This article was originally published on February 11, 2025, and was last reviewed on January 12, 2026.