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Without enough B12, the body struggles to produce healthy red blood cells, which in turn reduces the oxygen-carrying capacity of the blood

They also come pre-loaded with a methyl group, which is useful

An update International journal of laboratory hematology,The official journal of the international society of the laboratory hematology, First published: 11 January 2009
AOD 9604 does not affect digestion

Potassium supplements taken concurrently with b12 injections may theoretically reduce b12 effectiveness, but this interaction rarely causes clinical problems

The severity and duration of your deficiency matters someone who's been low for years will take longer to fully recover than someone who's been trending down for a few months