Those who want to inform themselves on a vegan diet, will automatically be confronted with the phenomenon of B12. This issue is constantly exploited by omnivorous people in discussions about a purely vegetal way of living. Often sentences like the following can be heard: "How can a diet be healthy if it only works when vitamin supplements are taken in?" Or: "If it was intended by nature that humans should not eat animals, how come man cannot produce vitamin B12 himself?"
Admittedly, a vegan diet should as a precaution be completed with B12 supplements. The abstruse thing
about it is:
… and this is achieved with the very supplements that the opponents of veganism condemn as unnatural. Another thing is that even omnivorous people often lack vitamin B12 and frequently other forms of deficiencies or diet-based illnesses can be observed with them. For any kind of diet can be deficient if it does not contain certain components at a sufficient degree.
Vitamin B12 is synthesized by bacteria, which obviously live in and on the ground, on algae in the sea and in the intestines of mammals. http://www.vibrancyuk.com/B12.html
In a natural nutrition cycle, wildlife animals would take in these bacteria – and subsequently the vitamin – when feeding. The take-in of this vitamin would not be a problem for humans either, if not all the products were cleaned and washed so meticulously today.
Yet, mammals cannot synthesize the vitamin themselves. And as animals in industrial livestock farming are deprived of the possibility to feed in a natural way, this vitamin has to be added to their feed. There is only one exception: ruminants like cows, which can synthesize the vitamin themselves in a special stomach if they provide of a sufficient supply of cobalt. But - as a consequence – an appropriate supply of cobalt in the feed is a prerequisite.
So, in order to provide a sufficient supply of vitamin B12, it is synthesized industrially and it has become an integral component of fattening feed.
As an example you can study the feeding plan of the German company "Vitamiral": http://www.vitamiral.de/de/vitamiral/navivitamiral/produktenord/schweine_9/schweine_10.html
This company produces fattening feed which is enriched with the required nutritional supplements. It can be seen, e.g. that pig feed contains a vitamin- B- complex, which consists of vitamins B1, B2, B6 and B12.
So the argument that a vegan diet contains no vitamin B12 is refuted, for omnivorous people as well as vegans take in the same vitamin supplements. To enable omnivorous people to do so, it is necessary to kill an animal beforehand. Vegans take it in directly in its natural form.
Moreover it would not be justified to eat animal products, which are evidently harmful to our health (cf. Studies), for the mere reason that they contain a certain necessary component, when you can take it in in a far simpler way. Vitamin B12 supplements are available in the form of pills, in enriched vegetable drinks, meat surrogates and even in toothpaste.