Actually, B12 supplements are not “artificially produced.” B12 is produced by bacteria and is harvested for use in supplements; it’s not artificially synthesized. Many bacteria that produce B12 are present in the soil. Animals ingest much more soil than humans do, and the B12 ends up in their tissues. Also, meat is basically rotting flesh, and bacteria love this, so there will be plenty of B12 made by the bacteria on the raw meat as well. In the days before we had to worry about what was in our soil, it was safe to eat vegetables or fruit with some dirt on them, and humans were able to get B12 this way. Our highly sanitized food system makes it difficult to get B12 from vegetables now. So, anyway, all that to say B12 comes from a completely vegan and natural source (bacteria), and there is nothing artificial about eating a vegan diet. Millions of vegans out there are completely healthy with no animal products whatsoever. Even if B12 supplements were artificially produced, the 100% natural way is not necessarily always the best way to go. If it was, then we should all still be living in the wild.
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Whatever diet you choose to eat,it should provide all the nutrients you need from plants and/or animals that occur naturally. A vegan diet is deficient in B-12. It is necessary to take an artificially produced supplement. This to me indicates that a vegan diet is not one naturally suited to humans.