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b12 injection is what drug class Cyanocobalamin: Package Insert / Prescribing Information Hydroxocobalamin (Vitamin B12): Uses, Alternatives,
Description
[DOI] [PubMed] [Google Scholar] 11.North BJ, et al
Consistent Care

B12 deficiency can also lead to the destruction of immature red blood cells in the bone marrow, which can cause jaundice (yellowing of the skin and whites of the eyes)

However, conventional oral B12 supplements, such as cyanocobalamin and methylcobalamin, face significant challenges during their transit through the GI tract (23)
