B-12 is a microbe that covers the earth. It does not come from plants or animals. It comes from dirt and rivers and streams. Since we have evolved to live over 30 years old by decontaminating (sanitizing) our food and water so that we don’t catch diseases, we have also destroyed our natural sources of B-12. Meat eaters get B-12 because their meat was supplemented when it was alive. We are much better off taking the supplements ourselves.