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Only approximately 1-4% gets absorbed via the gut, so taking B12 sublingually is the best absorption avenue (holding it under the tongue or between the gums and cheek is most common)
Nat Rev Neurosci, 13:77-93
Developing a singlestage continuous process strategy for vitamin B 12 production with Propionibacterium freudenreichii
J Zhejiang Univ Sci B (2019) 20(5):43748
