Q, Below is a list of bacteria that produces B12.. The origional information came from Livestrong. I am looking at other places to get more info. Here is the origional link for that quote I took.
http://www.livestrong.com/article/374162-signs-symptoms-of-high-b12/
It is saying that Vit B12 is being manufactured by the bacteria in the small intestine in significant amounts..
"Only bacteria and archaea have the enzymes required for its synthesis,"
Vit B12 cannot be made by plants or animals[2], as the only type of organisms that have the enzymes required for the synthesis of B12 are bacteria and archaea. The total synthesis of B12 was reported by Robert Burns Woodward[3][4] and Albert Eschenmoser[5][6], and remains one of the classic feats of total synthesis.
Species from the following genera are known to synthesize B12: Aerobacter, Agrobacterium, Alcaligenes, Azotobacter, Bacillus, Clostridium, Corynebacterium, Flavobacterium, Micromonospora, Mycobacterium, Nocardia, Propionibacterium, Protaminobacter, Proteus, Pseudomonas, Rhizobium, Salmonella, Serratia, Streptomyces, Streptococcus and Xanthomonas. Industrial production of B12 is through fermentation of selected microorganisms.[7] The most used species are Pseudomonas denitrificans and Propionibacterium shermanii, often genetically engineered and grown under special conditions to enhance yield.
http://en.wikipedia.org/wiki/Cyanocobalamin#_note-b12plant
Steve
Post Edited (twiggs) : 12/10/2012 7:24:11 AM (GMT-7)