California Proposition 65 

WARNING:  Some of the products we offer may contain chemicals known to the state of California to cause cancer, birth defects, and/or other reproductive harm.

Chemical List: https://oehha.ca.gov/proposition-65/proposition-65-list

CA PROP 65 requires a warning label on any product that is known to contain or may contain any of the more than 800 chemicals that the California Air Resources Board considers harmful. The warning does not mean that these products will necessarily cause cancer or reproductive harm. A PROP 65 warning does not mean a product is in violation of any safety standard or requirement. The California government has further clarified that "the fact that a product bears a Proposition 65 warning does not mean by itself that the product is unsafe." The CA government has also explained that "You could think of Proposition 65 more as a 'right to know' law than a pure product safety law."