Vitamin B12 The Nutrition Source The B12 in meat is from supplements given to the cows.so why not just take the supplement directly : r vegan Vitamin B12 Dosage: What Is the Proper Daily Amount? Dr. Axe Vitamin B12 is a part of the B vitamin family. What are the best foods with vitamin B12 that you can add to your family's diet? 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