does b12 injection help with anemia Are Vitamin Shots Right for You? Big Benefits of Vitamin B12
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They don't even belong in the same pharmacological category

doi: 10.1021/acs.jmedchem.9b00206
Data derived for the PK deficiency population drawn from the Pyruvate Kinase Deficiency NHS

Vitamin B12 oral supplements Vitamin B12 oral supplements are also effective in treating pernicious anemia

Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called the intrinsic factor
