There are certain nutrients -- like B vitamins -- that people have a hard time getting enough of from plants. It's not hard to get enough protein. It is hard to get enough of some other things.
That's common knowledge. It isn't something I need to prove.
B vitamins need to be supplemented for most people, plant-based or otherwise. Almost all livestock is supplemented, too, which is how most people who meat get any B-12 at all.
As for anything else, because you imply there are other vitamins that are lacking in plant-based diets, the onus to provide proof is definitely on you.
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