[tomweingarten]

B12 is largely misunderstood. B12 isn't produced by any animals, it's only produced by certain bacteria. It used to be available in plant based diets, but modern hygenic practices have more or less stopped that. In modern industrial farming it's common for the animals to not get enough B12 either, so they often get B12 from supplements as well.

Fortunately it's incredibly cheap to synthesize supplements and you don't need much of it at all, so this is not really a concern for vegans.

https://www.forksoverknives.com/vitamin-b12-questions-answer...