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The only known natural source of cobalamin synthesis (called cyanocobalamin) is in microorganisms that grow in species of plants such as mushrooms, algae and mosses. Neither plants nor animals produce B 12, and this is exactly why both vegans and omnivores have a hard time getting it. By the same token, so do all other animals, and animal flesh is not actually a good source of it. Again, any animal source of B12 is only secondary, as with all other nutrients, but in this case, it is synthesized by microorganisms rather than plants. There is no practical difference, however, as the B12 which livestock ingest still comes from plants. Cyanocobalamin bacteria are aerobic, meaning they need air/oxygen and sunlight for their environment, and water and plants to feed on. Like other aerobic organisms, they do not survive in the anaerobic conditions of animal guts. When you eat animal flesh, the B12 you are getting is actually their excrement.
Still, the cuts of flesh which meat-eaters consume do not contain B12. What do contain it are the internal organs—particularly the liver, heart and kidneys. However, this is only because of the concentration of the bacteria; the vitamin is synthesized by the bacteria, not the animal itself. So the liver and the kidneys are good sources because the microorganisms have been ingested and entered the bloodstream of the victim, and its body is in the process of filtering them out—as waste. Obviously, these are not live bacteria at this stage, and we have cause to wonder why anyone would think that having an abundance of them in one’s bloodstream is a good idea. The fact that it is only possible to get them from animal products by way of blood, urine or feces ought to be a clue as to whether God intended it for us or not. However, it will be argued that plants are an equally poor source of B12. This is generally true, but it also assumes that the plants have been washed, and that the bacteria are therefore removed from the source, which is not necessarily applicable to every situation, though it is perhaps still advisable to wash one’s food, especially considering that most produce is grown with sewage (and organic produce is grown with bone meal), and you just do not know where it has been unless you grew it yourself. But this only points to the fact that ideally, people should be gardening to grow their own food, and that even the act of washing one’s vegetables is unnatural and counterproductive to health.
Furthermore—and this is where the objection falls apart—we hardly need any of this vitamin at all to sustain optimal health. The RDA for vitamin B12 is only 2.4 (or 3) micrograms, and the body’s cells are extremely conservative and efficient in its use. Only waste bile actually disposes of the body’s B12 stores, meaning, essentially, that B12 loss only actually happens by way of consumption of animal proteins, as that is what causes excess bile production. Deficiency can also result from digestive disorders such as Crohn’s disease or celiac disease, but not simply from being a vegan. If anything, the opposite is true; carbon monoxide is known to inhibit B 12 uptake, so avoiding oxidants is important for B12 absorption. And that necessarily means that the less antioxidants you have in your diet (which you can only get from plants), and the more ROS you have in it (which typically come from acidic foods), the more likely it will be that your body will not be able to make use of whatever B12 you consume.
Regardless of all the recent hype generated by the low-carb faddists, it has been known ever since its initial discovery that meat-eaters are more likely to be B12 deficient. The main problem is that the body requires so little of it that it could hardly be measured half a century ago, so there were no assays to determine whether foodstuffs in nutritional analyses contained sufficient quantities. The companies that are marketing their supplements now (and, therefore, that are informing the public) are relying on data which have literally been obsolete for decades. Due to advances in technology since then, current books on nutrition now state that there is B 12 in any food that contains quantities of the B vitamin complex, (source:
877) and that includes most plant foods, including not just dark green or orange-colored fruits and vegetables, but things like beans and fortified cereals or milks, as well.
Even the 3 mcg figure is unreasonable, as it is taken not from scientific analysis, but from hematological data demonstrating a rough norm among omnivorous humans, which is anything but an indication of what the true amounts ought to be. Even still, the low overall requirement means an extremely low concentration of B12 is sufficient for our dietary needs, and for practical purposes, can simply be gained from eating the right mushrooms, or even things like corn or alfalfa. As a general rule, the more surface area of a particular that is consumed, or the more contact which this surface has with the soil, the more B12-producing bacteria can be assumed to grow on it. So we are once again led back to the conclusion that the ideal source is leafy green vegetables, or beats and carrots (especially if the greens are eaten or juiced). Also, cyanobalamin bacteria are destroyed by pesticides, so using organic vegetables is as essential as leaving them unwashed is, as the modification of the plants is done specifically to make them resilient to insects and bacteria. For these reasons, we believe that the best source of B12 is what livestock would normally get it from if left to themselves: grass, which should be juiced. On the other hand, many nondairy milks are fortified with vitamins B12 and D 2, and with calcium, the other nutrients typically found in or used to fortify cow milk, so these provide a much healthier safer alternative.
The alternative, as we have stated over and over, is to get higher concentrations from the disease-infested corpses, breast milk and menstruations of shamelessly tortured sentient creatures, which inevitably leads to poor health, disease and premature, agonizing death. It is true that excessive consumption of B12 from highly concentrated sources like rat intestines and swine livers could potentially cover the loss attributable to malabsorption and inflammation factors like bile production and intestinal bleeding, but this in no way implies that even these, much less animal flesh in general, is a better source when all the other factors are considered. As with the role of insulin in glucose transport, the major factor to consider is not how much of the vitamin (or of the bacteria) is consumed, but how well the body uses it (how well the intrinsic factor is able to do its job, without encountering obstacles, such as damage to the pancreas, the presence of pharmaceutical chemicals, infection or internal bleeding).
In short, the principle cause for poor B12 transport (commonly mistaken for B 12 deficiency) is the same as any other: inflammation due to the presence of animal proteins. So, without a doubt, the best way to make sure you are not deficient is to go vegan. Beyond that, if you want to take supplements to be safe, we do not see any harm in that. However, the necessity of such an act depends on how far removed you are from a decent food source, and if that is a real cause for concern for you, then B12 deficiency really ought to be the least of your concerns. Truly, if there was anything actually wrong or inherently dangerous about a plant-based diet, then the omnivores would have found a better objection by now. Their failure, after all, is not due to a lack of trying.