taste in mouth after b12 injection Vitamin Shots Confer No Benefit vs. a Supplement 10 Causes of Bitter Taste
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The dosage also affects the effectiveness of the injection
10.1016/j.cell.2013.11.037 [DOI] [PMC free article] [PubMed] [Google Scholar] 5.Camacho-Pereira J, Tarrago MG, Chini CCS, Nin V, Escande C, Warner GM, et al

Generally more affordable compared to injections
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How Deep Should a B12 Injection Go

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Optic Nerve Atrophy: Administering cyanocobalamin to patients with Leber's disease or hereditary optic nerve atrophy should be done cautiously, as it may worsen the condition