Yes, Menadione is a giant red flag - and you'd never see it in a premium food (or should never); terrible K3 derivative, toxic even.
I see what you're getting at - and off the top of my head, I can't think of any kibbles that call out "food sources" as their vitamin source, but they may still use them. There are some canned foods that are just 95% meat with almost no additives, so you may be able to do your own vits that way (I'm thinking Fromms, Merrick and Wysong, I believe) - but can't think of any kibbles. I'm going to be keeping my eye out for this though, bc I do think it's less common. Would like to hear how they do.
