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Here are two links: and Share your own experience with vitamin B12 levels in the comment section

doi: 10.2337/db18-0638

Research & Evidence Current evidence for 5-Amino-1MQ centers on preclinical (animal and cell) research on NNMT inhibition, with limited human data to date

In this condition, the stomach fails to produce intrinsic factors, proteins responsible for the absorption of vitamin B12