can you take b12 tablets with b12 injections Vitamin Injections: What Need To Know Vitamin B12 injections vs tablets:

In the blood, about 80% of cobalamin is bound to haptocorrin, forming holohaptocorrin, a complex that has a dual function: (1) holohaptocorrin conveys cobalamin to the liver, where it taken up through endocytosis (mediated by asialoglycoprotein receptor, ASGPR)

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and (2) binding antibodies bind to the "cobalamin-intrinsic factor" complex and prevent its absorption at the terminal ileum

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