Can somebody explain to me how potassium, sodium, and iron interact with B12? I've read many of these responses but either I'm dumb (very possible) or I haven't read it correctly.

I know that once you start taking B12 you have to have your potassium checked and that potassium somehow interferes (right?) with iron and sodium.

But I don't know what that means. Should I eat MORE potassium when I'm taking lots of B12? Should I also eat more salt and iron?

Sorry for the questions, I must actually just be dumb...