There is vastly more than B12 at stake with vegan diets. https://www.diagnosisdiet.com/micronutrients-mental-health/ https://www.diagnosisdiet.com/micronutrien

There is vastly more than B12 at stake with vegan diets. https://www.diagnosisdiet.com/micronutrients-mental-health/ https://www.diagnosisdiet.com/micronutrients-mental-health/ Almost by definition it would be weird if vegan diets were not diets full of deficiencies, since they do not partake in wide amounts of food groups eaten for at least millenia. (And we have no record of any vegan societies, though a few vegetarian -ish ones.)