@mojo_raisin It's because of factory farming which is 97%+ of all production. Factory farmed animals don't have access to a healthy soil where they would normally get their B12 and other nutrients. That means rising animals for mass consumption is totally wrong.
Same goes with humans. People today are so separated from the healthy soil, they lack B12.
@mojo_raisin B12 is produced by soil bacteria. Wildlife don't have problem with B12, predator or herbivore.