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B12 injections are often preferred, especially in cases of malabsorption (where your body struggles to absorb B12 from food or tablets), as they deliver the vitamin directly into your bloodstream, bypassing any gut issues
It is a small organic molecule built on a quinolinium ring system, catalogued in PubChem as CID 950107 for the cation, with the formula C10H11N2 for the free cation and a molecular weight near 159.2
Both types of injections have few associated side effects and constitute very effective treatment
Liao H-J, Chen H-T, Chang C-H
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