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Poor dietary intake, digestive conditions, stomach surgery, and long-term use of certain medicines can all affect how well vitamin B12 is absorbed

Understanding the differences helps you set appropriate expectations, especially if you are switching between medications or comparing options

The peptides acidic residues (glutamate at position 2 and aspartate at position 3) have been proposed to facilitate interactions with chromatin-associated proteins and transcription regulatory complexes, consistent with observed epigenetic effects documented in in-vitro model systems

(PubMed) Zuin M, Cervellati C, Brombo G, Trentini A, Roncon L, Zuliani G

QUESTION See Answer What precautions should you take with vitamin B12 shots

Because its level in the blood is almost entirely dependent on the kidneys, it is a sensitive marker of renal function and is used to estimate GFR (Levey 1999)