classwikitable     Number  Average serum B   serum B    MMA   moll   HCY   moll   NonVegALactoOvoB            C  A  Tended to eat only small amounts of animal products  B   person was vegan  C  A low folate status could have contributed to the high HCY levels  HCY  homocysteine  MMA  methyl malonic acid  Iranian Villagers Halstead et al reported that some Iranian villagers with very little animal product intake dairy once a week meat once a month had normal B levels None had megaloblastic anemia Their average B level was  pgml which was quite high considering their diet The authors speculated this could be because their diets which were very low in protein allowed for Bproducing bacteria to ascend into the ileum where the B could be absorbed They also speculated that because they lived among their farm animals and their living areas were littered with feces they picked up enough B through contamination  Halstead et als  report was in contrast to Wokes et als  report  in which numerous British vegans were found to have neurological symptoms of B deficiency  Conclusion B production by bacteria in the small intestine is possible Some vegans can ward of overt vitamin B deficiency and even mild B deficiency by remaining cautious Now people like mihaiam may choose to doubt all these scientific findings hinging on their favourite antivegan blogs   Note   I hope these information helps anybody who is interested