I'm not aware of any essential nutrients lacking from a plant-based diet, aside from maybe B12, which is supplemented in animal feed and besides would probably

I'm not aware of any essential nutrients lacking from a plant-based diet, aside from maybe B12, which is supplemented in animal feed and besides would probably be provided by soil bacteria if agricultural soil was healthier and our produce wasn't washed so well. A few amino acids like taurine aren't in plants but are synthesized from others in the human body.