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<p>[QUOTE=&quot;calcol, post: 2650617, member: 77639&quot;]Only some microbes can synthesize vitamin B12, and cobalt must be in their growth medium for them to do it.&nbsp; Plants can neither make nor need vitamin B12, which is why plants are generally a poor source of it.&nbsp; Plants that have a little actually have it because they are hosting microbes or are contaminated with microbes. </p><p><br /></p><p>Vitamin B12 can be absorbed only in the small intestine, but not in the stomach.&nbsp; Some animals (cows, sheep, etc.) have fermentation in their stomach, where microbes produce B12 which passes to the small intestine and is absorbed.&nbsp; All animals and humans have bacteria in the large intestine that produce B12, but it can&#039;t be absorbed there.&nbsp; Some animals, but few humans, take advantage of this source of B12 by eating feces.</p><p><br /></p><p>Omnivores (e.g. humans) and carnivores obtain B12 by eating tissues of animals that have gained their B12 from microbial sources.&nbsp; Some humans obtain B12 by eating microbial products, B12 in pill form obtained from microbes, or certain plants that are &quot;contaminated&quot; with microbial B12.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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