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[119] Physiology [edit] Absorption [edit] Vitamin B 12 is absorbed by a B 12 -specific transport proteins or via passive diffusion

Nature 507 , 371375 (2014)

I found an ad for oral stuff that is well-absorbed and supposed to be just as good

the FDA rejected its NDI petition as a dietary supplement in 2014

Skipping that narrative detail causes an automatic denial on the drug line
