how often should you have b12 injection your vitamin injections be administered and how frequently should laboratory monitoring be performed? How Can a B12 Injection – Vitamin B12 Injections Dosage and

"Association of Vitamin B12 Deficiency with Homozygosity of the TT MTHFR C677T Genotype, Hyperhomocysteinemia, and Endothelial Cell Dysfunction"

If needle anxiety is significant, in-clinic administration or oral alternatives are more practical

Sci Rep (2018) 8(1):8637

In Japan and Malaysia, you can even get your B12 shots in supermarkets

[4] For example, biotin-dependent enzymes facilitate the conversion of pyruvate to oxaloacetate (an important step in gluconeogenesis), the synthesis of malonyl-CoA from acetyl-CoA (the first step in fatty acid biosynthesis), and the catabolism of certain amino acids into Krebs cycle intermediates