This is something I’ve always been really curious about, since a lot of chain restaurants and other food vendors tout their “secret recipe” as a selling point. KFC’s secret 11 herbs and spices comes to mind as a fairly infamous example. Since they’re secret, I assume they wouldn’t show up on an ingredients list and would just have “herbs and spices” as a placeholder? If a customer is severely allergic to one of the herbs or spices, eats KFC, goes into anaphylactic shock and sustains brain damage from lack of oxygen due to their airways closing up, could the restaurant be liable for the injury?
Trademark law is weaker than criminal law. This is similar to how you can’t use an NDA to cover a crime. (though many people think that it can, which is why so many creep use NDAs to silence their victims, not realizing that shit will show in discovery and make them look SUPER guilty)