If vitamin b12 is in meat and dairy, then where do the animals get their b12 from?

According to nutritionists, eating dead animals and animal derivatives (eg milk) provides some amount of vitamin b12.

However, it's not clear to me how these animals have b12 in their bodies.

How do animals like cows get vitamin b12 in their bodies?

  • 4
    From the intestinal bacteria as answered on Biology SE.
    – Jan
    Commented Dec 28, 2019 at 11:10
  • 1
    @Jan you should probably add that as an answer instead of a comment.
    – Aniruddha
    Commented Apr 21 at 9:22


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