Vitamin B12 1000MG People love to bring up B12 like it's a reason to eat meat. But here's the irony Even meat eaters can be deficient in B12. That's because B12 comes from bacteria in B12 doesn't magically come from animals, it's made by bacteria in soil. Farmed animals are literally injected with B12 these days because they don't get it from food anymore. We scrub and The Four Types of Vitamin B12: Which One Is Right for You? The B12 in meat is from supplements given to the cows.so why not just take the supplement directly : r vegan