What is a P65 warning, and why is it important? It seems that P65 warnings are appearing on more and more products these days. When you see a label that says, “This product can expose you to chemicals known to the State of California. It may cause cancer, birth defects, or other reproductive harm,” it may worry you.
The truth is, P65 labels should cause some concern. In this blog, you’ll find more information and resources to make more informed decisions about the products you purchase.

- Proposition 65 requires California to list chemicals known to cause cancer, birth defects, or reproductive harm, with warnings on relevant products.
- Warnings apply mainly to products sold in California but can help consumers nationwide make informed purchasing decisions.
- Noncompliance can lead to significant financial penalties and legal actions against businesses selling affected products.
What is a P65?
Proposition 65, or Prop 65, is a California law. This law requires California to publish a list of chemicals known to cause cancer, birth defects, or reproductive harm. The state updates the list annually and requires businesses to provide these warnings to Californians.
Consumer products sold to Californians must have a Prop 65 warning. If you don’t live in California, you may see labels, packaging, or websites that sell products to Californians.
DON’T LIVE IN CALIFORNIA?
You can still benefit from these warnings and make more informed decisions about the products that you purchase.
What Chemicals are on the Prop 65 List?
The Proposition 65 list features a diverse array of chemicals. It includes both naturally occurring and synthetic varieties. The substances on the list may be additives or ingredients in various products. Here are a few examples:
- Pesticides for agriculture and gardening products.
- Cleaning Supplies and Personal Care Items
- Certain Foods and Drugs with preservatives or active ingredients.
- Dyes and Solvents used for manufacturing and artistic applications.
Additionally, many of the listed chemicals are critical to manufacturing and construction; some are byproducts of chemical reactions. The comprehensive P65 list is vital for maintaining awareness and safety standards in California.
P65 Enforcement
Several entities enforce Proposition 65. The California Attorney General’s Office ensures businesses adhere to the law’s regulations.
Private people and groups acting for the public good may start legal action if they believe a violation has occurred.
Penalties for Violating P65
Businesses that violate Proposition 65 may face significant financial repercussions.
In addition to financial penalties, businesses can face legal action requiring compliance. This can incur attorney fees and court costs, further straining a company’s resources.
Businesses should invest in ensuring compliance with Proposition 65, especially if they sell to Californians. Regular reviews of products and processes, alongside clear labeling, can mitigate the risk of violations or costly penalties.
Prop65 Resources
The California Office of Environmental Health Hazard Assessment (OEHHA) operates the P65 website. It provides the public with information about chemicals, products, and locations associated with P65 warnings.
California must update and publish a list of these chemicals each year. Currently, approximately 900 chemicals are on the list.
Proposition 65 warnings are not just for physical goods and foods. It also prohibits California businesses from knowingly discharging significant amounts of chemicals into drinking water sources.
Here are a few resources that might be helpful to you:
Want to do more research about P65 warnings? Here are a few resources that might be helpful to you:
- What You Should Know About P65 Warnings
- PEScience: California Proposition 65 FAQ
- Loma Linda University Health: California’s cancer warnings: What are the real risks?
- Cancer.org: Cancer Warning Labels Based on California’s Proposition 65
- Newsweek: Here’s Why Everything Gives You Cancer in California
P65 warnings help Californians make informed choices about chemical exposure. These chemicals can cause cancer, birth defects, or reproductive harm. If you don’t live in California, you can still benefit from these warnings and make more informed decisions about the products that you purchase.



















Brandon says
Hello Suzanna, thanks for your comment! As your situation shows, it’s important to pay attention to details when purchasing products. Take care!
Suzanna Luck says
I live in Arizona and purchased a product that came from CA. No label on it about P65. I was reading the suggested use and warning. It talks about the exposure to chemical, could cause cancer and birth defects. Then it states for more information go to http://www.P65warnings.ca.gov. Please make these label larger.