At this point, there should probably just be a generic "THIS PRODUCT IS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER" sticker that companies can stick on pretty much anything they sell there. <eyeroll>
WARNING: This human being contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Just because something is also produced by the human body or is "natural" doesn't mean it is good for humans to ingest, especially in significant quantities over long periods of time.
Which is I think is an inflammatory way to phrase it. There should be a level shown: "This product has lead levels of 11ppb, California drinking water has lead levels of 11ppb".
edit: Oh and apple seeds naturally contain cyanide, bananas have radioactive potassium-40, fish has mercury and on and on.