According to this source, small amounts of B12 has been found in ie.in barley malt syrup and sourdough bread:
Type: Posts; User: Korn; Keyword(s):
0.02-0.5 mcg/100 mcg in barley malt syrup, sourdough bread and more
According to this source, small amounts of B12 has been found in ie.in barley malt syrup and sourdough bread:
PubMed on Lactobacillus Reuteri, sourdough and B12
From http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=193752