Ran across this paper from 2022. Gives an impressive but understandable overview of B12 metabolism from ingestion to cellular uptake, including a straightforward overview of the required transporters and associated genes. Pitfalls of various b12 related blood tests are discussed. PA & folate issues are briefly addressed. Includes some fun diagrams. Overall looks like a comprehensive and good overview of B12D! Bonus, it's open access so freely available for all to read.
Kósa, Magdolna, et al. "Vitamin B12 (Cobalamin): Its Fate from Ingestion to Metabolism with Particular Emphasis on Diagnostic Approaches of Acquired Neonatal/Infantile Deficiency Detected by Newborn Screening." Metabolites 12.11 (2022): 1104.
B12 & Folate Deficiency and tolerability of antibiotics (why I react badly to them)
Two positive IFA tests, one negative. But positives were all about an hour after receiving b12 injections?
I'm new here - normal (?) B12 levels but low folate - help, I don't know what to think...
B12 and periods
